Gmail signature - no option to remove it

Hello

I can’t get rid of my Gmail signature of Avast.

I’ve red all the instructions in the forum, but it seems that in the version I use there is no checkbox to remove the E-mail signature. The version I use is 20.10.2442 (build 20.10.5824.618)

The signature that intruded my emails looks like this:

https://i.postimg.cc/W4Y6Pb6H/image.png

In the general settings there is no checkbox for the signature:

https://i.postimg.cc/Z5V6rKg5/image.png

In protection as well:

https://i.postimg.cc/SKRCVbF7/image.png

I didn’t have mail shield installed before, so I installed it to see if some new options will be unlocked but when installed the checkbox for signature was unchecked:

https://i.postimg.cc/zGtRy2bL/image.png

So please tell me what to do to remove the signature from Gmail?

If I look closely, that signature has the AVG link in it. Did you have AVG in the past?