How to display a 'delete button' on the touchbar?

Solution 1:

I haven't tried this but in theory I think it could work.

You can try making the touchbar show function keys for that app so that you do not need to hold fn: https://support.apple.com/en-us/HT207240

Then download Karabiner-Elements (which is free) to change one of the function keys to a delete key.

Solution 2:

Actually, you already can do that without the touchbar :

• With the regular Delete key can be done by holding down the Function, or fn key while pressing it.

• By pressing Control + D.

• You can delete the entire word behind the cursor by pressing Control + Delete or Option + Delete.

• You can delete the entire line of text or paragraph behind the cursor by pressing Command + Delete.

But if you really want a one-press-button solution, you could use BetterTouchTool (and for $5, is almost a free option...) that allow you to make personalize shortcut ; or simply do an automator workflow to do a delete action (every workflow you make will appear on a section in the touchbar, more info here).