Preference: Behavior: Edit Metadata Layout: has 3 choices
Default has 2 (folder type) Tabs
All on 1 Tab
There is
Preferences: Tweaks:
ID: metadata_edit_custom_column_order
Controls the order that custom columns are listed in edit metadata single and bulk. The columns listed in the tweak are displayed first and in the order provided. Any columns not listed are displayed after the listed ones, in alphabetical order. Do note that this tweak does not change the size of the edit widgets. Putting comments widgets in this list may result in some odd widget spacing when using two-column mode. Enter a comma-separated list of custom field lookup names, as in metadata_edit_custom_column_order = ['#genre', '#mytags', '#etc']
That might help a bit