One way is to set your repeats to ONE instead of the default THREE. Another way is to go to EDIT/SONG FORM/UNFOLD. This will turn your chart into one single linear "template" like what you are describing. Then you can add or delete bars as your arrangement requires. Sorry, I can't provide screen shots like some of the hot-shots here can, but maybe that's enough instruction. Rather easily done.

BIAB 2021 Audiophile. Windows 10 64bit. Songwriter, lyricist, composer(?) loving all styles. Some pre-BIAB music from Farfetched Tangmo Band's first CD. https://alonetone.com/tangmo/playlists/close-to-the-ground