In the FRW Reference 5.5
it says there are 6 ways how to select several items, in my case images.
But i can’t select more than one either way.
(Both with CSS on / off).
So you want to select them all to perfectly align them?
If that is the case then ‘draw’ a marquee around them all and Item>Align
But a better workflow is to create your initial item, apply the action, set base parameters and then duplicate as many times as necessary with no horizontal or vertical shift.
Then it is just a matter of selecting each individual item in the Site/Page panel to change individual settings. Or with a single item selected hitting the Enter key highlights the item for editing.