If there's no underlying issue you need to address, Barb, and all you want to do is stop the link to your WikiTree compact family tree from appearing when others find you at GEDmatch, here's how you can do it:
On the main GEDmatch page after you log in, on the left and down the page a bit is an item labeled "EDIT or DELETE your DNA resource profiles." Don't be frightened of the terminology! Click that; scroll down to see a table labeled "Your raw DNA kits."
On the line that shows your primary kit number you'll see, at the far right, a button labeled "Select." Click that, and then click "Edit" at the bottom of the table. Look for the section that contains "WikiTree Link." Select "Disable" and then "Save Changes." Voila! You're done!