How to reformat a score after changing the staves size?

I *ve got a score with 40 staves. Since I’m working on two computerscreens I didn’t realise how small the single staves have become. After printing out the score I felt the need to adjust the stave size. Unfortunately Dorico keeps the page breaks instead of reformatting the whole score. I was searching hard for any information how to do a proper reformatting, but could not find how to achieve this. I suppose there must be a quite simple solution, but how??
Any advice? Rainer

Show signposts, select all frame and system breaks, and delete them.

Thanks, that worked!

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Works even in one go, you can also assign a shortcut to it: