I think it would improve the UX and visual flow between the BTT Launcher and hello.ai Launcher, the search menu bar status items window and other popup windows if they all use the same default width.
Some of these windows you can customize the dimensions but not all of them.
Thank you 
Original comment: Discussion: BetterTouchTool Launcher / Spotlight Replacement (very much work in progress) - #147 by yougotwill