Do you have the same issue if you follow the OP’s steps to reproduce it?
Yes
Provide extra information to complete the original description of the issue:
Ground lift (heat only) is way too strong so that it basically allows us to fly a glider in a straight line over urban areas.
The effect glider pilots are looking for, on flat terrain, is having to find small patches of ground lift where they can circle to gain altitude and then to glide to another such patch. Without that effect, flying a glider feels too much like flying a motor plane.
If relevant, provide additional screenshots/video: