The contents of one of the columns cannot be edited.

[AndGab]

I'm still new to AppSheet (and my English isn't very good either). My problem may seem simple at first, but maybe it's not. Editing of recorded data was disabled in my app at first. Later I experimented with restricting editing based on USEREMAIL() and also hiding the EDIT button. Later, a different need arose, so I turned off these limits, despite this, the content of one column cannot be edited in the 'Detail' view, but the rest can be edited. Of course, 'Editable' is checked on the Table tab. What have I done wrong?
By the way, the field type is text, and no validation condition is activated.

[James_Burns]

If you're talking about editing in the detail view then it sounds like you don't have that column added to the list of 'Quick edit columns'. 

[AndGab]

Unfortunately, this is not the case. Moreover, I already tried to add quick edit columns, but in the drop-down list only this non-editable field does not appear, the others do.