Trim Region End to Next Region    ⇧\

Make the end of the current region extend to the start of the next region. Removes gaps between regions. I get confused by assuming that “trim” means cut.

Resize regions in the Logic Pro Tracks area — Apple Support

Choose Edit > Trim > Region End to Next Region (or use the corresponding key command).

trim | trim | verb (trims, trimming, trimmed) [with object] 1 make (something) neat or of the required size or form by cutting away irregular or unwanted parts: trim the grass using a sharp mower. • cut off (irregular or unwanted parts): he was trimming the fat off some pork chops. • reduce the size, amount, or number of (something, typically expenditure or costs): Congress had to decide which current defense programs should be trimmed. • [no object] (trim down) (of a person) lose weight; become slimmer: he works on trimming down and eating right. • firm up or lose weight from (a part of one’s body). 2 (usually be trimmed) decorate (something), typically with contrasting items or pieces of material: a pair of black leather gloves trimmed with fake fur. 3 adjust (sails) to take best advantage of the wind. • adjust the forward and after drafts of (a vessel) by changing the distribution of weight on board, especially cargo and ballast. • keep or adjust the degree to which (an aircraft) can be maintained at a constant altitude without any control forces being present. • [no object] adapt one’s views to the prevailing political trends for personal advancement. 4 informal, dated get the better of (someone), typically by cheating them out of money. 5 informal, dated rebuke (someone) angrily.

  Collapse/Expand All Inspector Tiles

This is a very handy tool. The typical way to collapse/expand things is to click on the disclosure triangle by the name e.g., “Quick Help”, “Region”, and “Track”. If I want to work with the channel strip inspector I often have to move my mouse around and collapse inspectors that are hiding the top of the channel strip. I can move the mouse to the closest inspector and option-click the handle to collapse/expand all the inspectors.

This is a nice additional way to “clear the deck”.

Sometimes I wish I could rearrange the order of the inspectors.

  Optimize File(s)…    ⌃O

Removes unused audio. It reads like if I have a file with 5 regions and I delete the middle 2 then a new audio file will be created that is the 3 remaining regions. This is not the case in my simple experiments.

General advice is — do not use this command — whatever savings might be achieved isn’t worth the potential of destroying the audio files in your project.

Add and delete audio files in Logic Pro — Apple Support

Logic Pro determines which (file) segments are not contained in any of the regions used in the Tracks area. These segments are deleted, and the remaining portions of the audio file are retained and aligned side-by-side in the file. The regions in the Project Audio Browser are redefined and the project is automatically saved.