- Touchscreen Stop during activity
I do not think you can do that. This can be done on other watches like the FR series, etc. For the Venu 3 series, you can reduce the sensitivity of touch, but cannot disable the touch.
To do that, Go to Settings>System>Display >During Activity. Under there, tap on Sensitivity and select the Low option.
Totally agree that this functionality is needed. Not only for during activities, but in general.
My prior watch from another manufacturer could do this and it increased battery life by 2-3 days.
As PRK91 mentioned this functionality is currently not available on the Venu series watches. However, you can lock the touchscreen manually: How Do I Lock the Touchscreen on My Fitness Watch?
For addtional support reach out to your local Garmin Support team.