Open with text editor: Steam\steamapps\common\SpellForce3_2019\bin_win32\configs\visual.txt

Search for line:
"maximum distance of camera from target"
MaxDistance

normal: "840"
"1440" instead work fine for me.

Same possible with:
"minimum distance of camera from target"
MinDistance

For me "100" work fine

save the file, and start the game