I use the kinda hidden three finger dragging gesture that you can activate like this: 1. Choose Apple menu > System Preferences, then click Accessibility. 2. Select Pointer Control in the sidebar. (In earlier versions of macOS, select Mouse & Trackpad.) 3. Click the Trackpad Options button. 4. Select ”Enable dragging,” then choose ”three finger drag” from the menu. 5. Click OK.
Sadly, it's supported less and less in Apple's own apps:
- if you use the gesture in Finder, it can get confused and mess up all mouse clicks
- it doesn't work at all with the sliders in the new control center menu