how to hide numbers in tab listing

Just started using Tab Outliner. Sorry if I'm referring to things by the wrong names.

Trying to maximize the clarity of collapsed tab titles.

When all my windows are collapsed in Tabs Outliner, there is a number that appears to the left of the tab name. The number reflects the number of sub-tabs contained in that window (and sometimes a number in parentheses... not sure what that is.) The number makes the left edge of column names jagged, therefore more difficult to read.

I would like to disable display of the numbers:

I don't find the information to be relevant.

The numbers interfere with the left alignment of my tabs; in other words, a double-digit number will push the title farther to the right than a single digit-number.

By the way, is there a feature that can alphabetize the visible tabs? This could be helpful.

Thank you.