An alternate layout - move all text frames

I prepared a book project for a regular A5 paper size - 148 x 210 mm. Now I was said that the size of a document should be a bit smaller 146 x 208. So I created an alternative layout successfully with a new page size.

What is the problem is that I need to have all the same text frames but moved a bit to fit properly into a new layout. I cannot have new text frames because some of them were shorter, some larger, some moved a bit on certain pages and so on. This was on many pages and irregular.

When I created a new layout, text frames are centered vertically so that there is usually 1 mm less on bottom and top from a text frame to the border of pages. I would like to change it. To have them preserve the distance from a top of a page to the text frame border and them move them manually - all at once the same distance.

As to the text frames vertically they preserve the distance "inside" but I would like to move them all 1 mm to inside.

When I change the size of the document the effect is the same.

I do not see any option to do this when creating an alternative layout.

Is there any way to move all text frames on many pages at once? I cannot move all of them, in hundreds, one by one...