Fm 15 Pro Adv
No tool tip option. Not sure how to add or adjust tool tips.
Tool tips are located in the inspector. Select the desired object, open inspector if not already open, select the first icon on the left and tooltip is at the top.
inspector panel #1
I see that you are using the contextual menu on the field in FileMaker Pro (advanced) 15. See the FMPro 15 help:
https://fmhelp.filemaker.com/help/15/fmp/en/FMP_Help/tooltips.html Adding tooltips on layouts
Use the menus (at top):
View menu > Show > Tooltips
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