Use F5 on that bar and change the number of beats. It will normally be a 0 for a 4/4 bar; change the 0 to 2, for example, if you want a 2/4 measure. Don't forget to do F5 on the next bar and put 4 there if you want 4/4 time to resume.

The part markers can only be at the start of a bar.


BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.