Multimeasure rests length problem

1. When I used this function in Musescore2, I could shorten length of multimeasure like 2.png, by pressing Shift + [. However, in musescore3, I can't shorten the length like using Musescore2(1.png). What is the problem?

2. This problem also happens when I use system break function. When using musescore2, I could place 8 or more measures by using Shift + [, but in musescore3, sometimes I can't place 8 measure in same line. (3.png) How can I shorten measure more?

thanks.