Setting the option showHoeOverlaysOnlyWhenShifting in tfc-client.toml to either true or false will still show the overlay regardless of "shifting". Tested against the following criteria in a fresh instance.

MC: 1.20.1
Forge: 47.2.6, 47.2.18, 47.2.30, 47.2.32, (neo) 47.1.105
TFC: 3.2.2
Mods:
• Patchouli (1.20.1-84)