How to change the behaviour of touchscreen in Ubuntu?

I have a touchscreen connected to my Ubuntu 22.04 PC. When I move my finger across screen, the cursor moves with it, but the left mouse button isn't being pressed at the same time. That is, it's e.g. impossible to select multiple items in a directory by just moving the cursor across them. To achieve that I need to double-click first. How to change that? I have my own app for gesture recognition and it just follows cursor when the left mouse button is pressed. This will be the only app running on this PC ever, so I don't need any extra functionality I will loose by changing this behavior. I've

Question by smsware on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.