THTX
Theratechnologies Inc. Common
stock NASDAQ

Make note of this. Whenever your option position is adjusted due to some corporate action -- like a split, merger, spinoff, special dividend, etc., -- do a google search like this:
theocc XXX option adjustment
Replace "XXX" with the ticker of your option. Usually the first or second search result will be an OCC option adjustment memo. When I do this for THTX, I get this memo:
https://infomemo.theocc.com/infomemos?number=57294
The gist of the memo is that the exercise deliverable for option contracts is now $3.01/share in cash. You can no longer exercise for shares.
Since your strike price is $5, you would be paying $5/share in cash to get back $3.01/share in cash, which is a $1.99/share loss. That is why your calls are worthless, because no one would pay $500 in order to receive $301.
You don't have to "Remove" the calls from your account. Just leave them there and they will disappear after the expiration date.

Make note of this. Whenever your option position is adjusted due to some corporate action -- like a split, merger, spinoff, special dividend, etc., -- do a google search like this:
theocc XXX option adjustment
Replace "XXX" with the ticker of your option. Usually the first or second search result will be an OCC option adjustment memo. When I do this for THTX, I get this memo:
https://infomemo.theocc.com/infomemos?number=57294
The gist of the memo is that the exercise deliverable for option contracts is now $3.01/share in cash. You can no longer exercise for shares.
Since your strike price is $5, you would be paying $5/share in cash to get back $3.01/share in cash, which is a $1.99/share loss. That is why your calls are worthless, because no one would pay $500 in order to receive $301.
You don't have to "Remove" the calls from your account. Just leave them there and they will disappear after the expiration date.