RailModeller Pro Forum

It's a simple question but I cannot find it in the app, nor in the forum.
How can I change the colour of the a selection tracks?
And also how can I change the colour of the background?

I see several colour palettes but if I change the colour there, nothing changes in my board.

I trie every combination of key's of my keyboard, but I can'nt find out to make a selection from several elements.I want to make a selection for adjust the heights of the tracks. If I use the mouse and select a part of the tracks, the option to adjust heights is not available in the trackdocument at...