Got "Not enough room to show "BetterTouchTool"" when using together with the app "Ice"

Ice is a similar app like Bartender, but it's free.

When I open "Search Menu Bar Items" in the Ice menubar, there is a big block

If I double click it, it shows error: "Not enough room to show "BetterTouchTool""

If I close BTT, everything is correct, but if I open BTT, some running apps will not show their icon on menubar, I guess BTT maybe occupy their room.

So, maybe turn on/off some settings in BTT can fix it? I don't know why BTT takes too much room on menubar, it is only one small icon there.

By the way, I just tried to close "Ice", some of the running app icons are still disappeared. If I close BTT, all disappeared icons come back. So it's none of the business with "Ice". Why BTT impacts other app's icon on menubar?