Mac OS 10.14.6
Version 6.0, build 5376 (14f9534)
I noticed a while ago that the 'Text Only' option under Customize Toolbar wouldn't stick... I would select 'Text Only' but as soon as I used one of the buttons for the first time it would switch back to 'Text & Icon' by itself.
I tried it again just now, but now it doesn't work at all... switching to 'Text Only' doesn't do anything, it continues to display icon & text.
'Icon Only' works as expected though.