Toolbar tool selection requires double-click

Windows11 pro with NVIDIA GeForce GTX 1650

A persistent problem I am experiencing is that when I want to change toolbar items, I must double-click the new item. How to resolve this so that I only need to click it once? This has been occurring for at least a year. I thought that upgrading to 2026 would fix it, but it did not.

I would first try a different mouse just to rule out a hardware issue.