What is the needed to be able to drag the mouse and select several pieces at once?

Module Design
1

In the module i’m working on, i can’t drag the mouse to select several pieces at once.
What am i missing?

thank you!

2

Where can we get the module to take a look?

3
4

Have you checked the “Band-Select Piece” setting in a “Does Not Stack” trait?

5

I solved it. Under Main Map / Properties, there must be a border thickness for selected counters.