Use the paid InShot Pro version
Export with the watermark removal option enabled
Watch for any in-app prompt to remove the watermark before saving
Use a different video editor that does not add a watermark
Crop the watermark out of the video if it appears at the edge
Cover the watermark with a sticker, text, or overlay
Edit the video in a desktop editor after exporting
Check InShot settings for any watermark toggle before exporting