It's often easiest to start a chart with a template and then delete any unused measures.
I mostly use the built-in 48-bar "new song" template https://forums.irealpro.com/threads/Templates&p=15058.327/#post-15058
Charts are easier to follow when measures are the same size. (if space permits)
Whenever possible, I prefer to use a template that has either 4, 4-space measures in a line (system)(48) or 8, 2-space measures in each line(96). Sometimes to save space, I'll mix 4-bar and 8-bar lines, but for the musician trying to follow the chart on the fly, it's best to keep charts as "square" as possible.