You can tweak the supports by clicking on "Supports painting.
After clicking, look at model from underneath again and you should see a shaded checkerboard pattern which is what Studio logic thinks is the correct support region.
If you increase/decrease the slider for “Highlight overhang areas” it should increase/decrease that pattern making supports larger or smaller as needed
You can increase/decrease the support that way.
Here is a post where another person had a support problem.
Trouble with support