<r>so my future workaround will be, if I want to use the grid properly, i have to set up the first wall directly to 0/0 on the grid. so the first room can be attached to 0/0. like this:<br/>
<IMG src="https://bilderupload.org/image/eaae87200-screenshot-2022-11-11-181.jpg"><s>[img]</s><URL url="https ...

or is that a bug, that walls don´t snap to the grid?

<r>yes, I use your suggestion as a workaround. There is potential to make that more comfortable without to have to do that. <br/>
Maybe you might be able to add an option "use 0/1/2 decimal". With that option I would not have to edit with enter. <br/>
<br/>
<URL url="https://bilderupload.org/bild ...

<r>hi, I tried to construct 2 walls with diffrent zoom (about zoomfactor 2) and the walls have exacly the same weird ",1 cm" measurements. I think the magnetism could be better if it would snap to a 1cm grid. - at least for me. <br/>
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I try to upload screenshots. the two walls are build by ...

hi,
not quite. in other words: I would like to edit walls in cm steps with the mouse. in version 7.0 my mouse movement produces mm steps on x and y axis. 1cm steps would be much easier to handle. (or 0,5cm)

Is there a way to set the x-y Grid to cm steps?

it is really hard to move objects and build walls in mm steps. I would like to use cm steps. That would be accurate enough and would be much easier to handle.
is there a way to set up that configuration?