Editing objects, layout parts, and the layout background > Adding tooltips on layouts
Adding tooltips on layouts
1. In Layout mode, select the object to which you want to add a tooltip.
2. Click Inspector Inspector button in the layout bar, then click the Position Position tab.
3. In the Position area, do the following.
Do this
Create a tooltip that displays static text
Type the text you want to appear as the tooltip in the Tooltip field.
Create a tooltip that displays the results of a calculation
Click Edit button.
In the Specify Calculation dialog box, build a formula for your calculation. Click OK.
4. Press Enter or Tab, or click outside the Inspector to apply the changes.
Tip  In Layout mode, choose View menu > Show > Tooltips to identify objects with tooltips. Objects with tooltips display a badge Tooltip badge in Layout mode.
You can add a tooltip to grouped objects. All objects in the group will display the same tooltip.
If the object’s tooltip calculation returns an empty string, no tooltip displays. For example, if your tooltip displays related data and the relationship is missing, the tooltip will be empty. If an error occurs in the calculation, the tooltip displays invalid or partially valid results with question marks.
Your operating system determines the tooltip font and font size.
Related topics 
Creating a layout
Viewing records as a form, list, or table