diff --git a/io_scene_psk_psa/psa/import_/operators.py b/io_scene_psk_psa/psa/import_/operators.py
index dbdff50..0dd98c9 100644
--- a/io_scene_psk_psa/psa/import_/operators.py
+++ b/io_scene_psk_psa/psa/import_/operators.py
@@ -190,67 +190,71 @@ class PSA_OT_import(Operator, ImportHelper):
         layout = self.layout
         pg = getattr(context.scene, 'psa_import')
 
-        if pg.psa_error:
-            row = layout.row()
-            row.label(text='Select a PSA file', icon='ERROR')
-        else:
-            box = layout.box()
+        sequences_header, sequences_panel = layout.panel('sequences_panel_id', default_closed=False)
+        sequences_header.label(text='Sequences')
 
-            box.label(text=f'Sequences ({len(pg.sequence_list)})', icon='ARMATURE_DATA')
+        if sequences_panel:
+            if pg.psa_error:
+                row = sequences_panel.row()
+                row.label(text='Select a PSA file', icon='ERROR')
+            else:
+                # Select buttons.
+                rows = max(3, min(len(pg.sequence_list), 10))
 
-            # Select buttons.
-            rows = max(3, min(len(pg.sequence_list), 10))
+                row = sequences_panel.row()
+                col = row.column()
 
-            row = box.row()
-            col = row.column()
+                row2 = col.row(align=True)
+                row2.label(text='Select')
+                row2.operator(PSA_OT_import_sequences_from_text.bl_idname, text='', icon='TEXT')
+                row2.operator(PSA_OT_import_sequences_select_all.bl_idname, text='All', icon='CHECKBOX_HLT')
+                row2.operator(PSA_OT_import_sequences_deselect_all.bl_idname, text='None', icon='CHECKBOX_DEHLT')
 
-            row2 = col.row(align=True)
-            row2.label(text='Select')
-            row2.operator(PSA_OT_import_sequences_from_text.bl_idname, text='', icon='TEXT')
-            row2.operator(PSA_OT_import_sequences_select_all.bl_idname, text='All', icon='CHECKBOX_HLT')
-            row2.operator(PSA_OT_import_sequences_deselect_all.bl_idname, text='None', icon='CHECKBOX_DEHLT')
+                col = col.row()
+                col.template_list('PSA_UL_import_sequences', '', pg, 'sequence_list', pg, 'sequence_list_index', rows=rows)
 
-            col = col.row()
-            col.template_list('PSA_UL_import_sequences', '', pg, 'sequence_list', pg, 'sequence_list_index', rows=rows)
-
-        col = layout.column(heading='')
-        col.use_property_split = True
-        col.use_property_decorate = False
-        col.prop(pg, 'should_overwrite')
-
-        col = layout.column(heading='Write')
-        col.use_property_split = True
-        col.use_property_decorate = False
-        col.prop(pg, 'should_write_keyframes')
-        col.prop(pg, 'should_write_metadata')
-
-        col = layout.column()
-        col.use_property_split = True
-        col.use_property_decorate = False
-        col.prop(pg, 'bone_mapping_mode')
-
-        if pg.should_write_keyframes:
-            col = layout.column(heading='Keyframes')
+            col = sequences_panel.column(heading='')
             col.use_property_split = True
             col.use_property_decorate = False
-            col.prop(pg, 'should_convert_to_samples')
-            col.separator()
-            # FPS
             col.prop(pg, 'fps_source')
             if pg.fps_source == 'CUSTOM':
                 col.prop(pg, 'fps_custom')
+            col.prop(pg, 'should_overwrite')
+            col.prop(pg, 'should_use_action_name_prefix')
+            if pg.should_use_action_name_prefix:
+                col.prop(pg, 'action_name_prefix')
 
-        col = layout.column(heading='Options')
-        col.use_property_split = True
-        col.use_property_decorate = False
-        col.prop(pg, 'should_use_fake_user')
-        col.prop(pg, 'should_stash')
-        col.prop(pg, 'should_use_config_file')
+        data_header, data_panel = layout.panel('data_panel_id', default_closed=False)
+        data_header.label(text='Data')
 
-        col.prop(pg, 'should_use_action_name_prefix')
+        if data_panel:
+            col = data_panel.column(heading='Write')
+            col.use_property_split = True
+            col.use_property_decorate = False
+            col.prop(pg, 'should_write_keyframes')
+            col.prop(pg, 'should_write_metadata')
 
-        if pg.should_use_action_name_prefix:
-            col.prop(pg, 'action_name_prefix')
+            if pg.should_write_keyframes:
+                col = col.column(heading='Keyframes')
+                col.use_property_split = True
+                col.use_property_decorate = False
+                col.prop(pg, 'should_convert_to_samples')
+
+        advanced_header, advanced_panel = layout.panel('advanced_panel_id', default_closed=True)
+        advanced_header.label(text='Advanced')
+
+        if advanced_panel:
+            col = advanced_panel.column()
+            col.use_property_split = True
+            col.use_property_decorate = False
+            col.prop(pg, 'bone_mapping_mode')
+
+            col = advanced_panel.column(heading='Options')
+            col.use_property_split = True
+            col.use_property_decorate = False
+            col.prop(pg, 'should_use_fake_user')
+            col.prop(pg, 'should_stash')
+            col.prop(pg, 'should_use_config_file')
 
 
 class PSA_FH_import(FileHandler):