Reference > Setting preferences > Setting layout preferences
Setting layout preferences
Layout preferences affect the way you work in Layout mode.
To set layout preferences:
1. Windows: Choose Edit menu > Preferences.
macOS: Choose FileMaker Pro menu > Preferences.
2. In the Preferences dialog box, click the Layout tab, and then set the options you want to use.
Do this
In Layout mode, keep the tool that you're using active until you click another tool or press Enter
Select Always lock layout tools.
Add new fields you define to the bottom of the current layout
Select Add newly defined fields to current layout.
Save layout changes without being prompted when exiting Layout mode
Select Save layout changes automatically (do not ask).
Related topics 
Editing objects, layout parts, and the layout background
Working with fields on a layout