Google Slides lets you choose custom autofit preferences for new text placeholders and text boxes. This can make future editing more predictable across presentations. It is important to separate this preference from the fitting settings of boxes that already exist in a deck.
Open the autofit preferences
In the desktop editor, choose Tools > Preferences. Enable Use custom autofit preferences and choose the offered behavior for text placeholders or text boxes. Review the wording in the dialog so you know which type of text container each choice controls.
Understand the scope
Google’s guidance says preference changes affect new content created after the change. Existing placeholders and boxes are not automatically rewritten. The help also notes a historical default change in January 2021, which is another reason old presentations may contain different behaviors.
To repair an existing box, select that box and use its own Text fitting controls. Do not repeatedly change the global preference while expecting an older placeholder to change retrospectively.
Test with a new example
Create a new text box on a disposable test slide and enter a short line followed by a longer example. Inspect whether its size or lettering changes as intended. Then check an older box separately to confirm that you understand the distinction. Use the preference to support your editing style, but continue reviewing readability. A default that shrinks text can hide excess content, while a default that expands containers can cause overlaps if the surrounding slide has little available space.
References
Reviewed against the linked official product guidance on November 3, 2026. Features, limits, screen labels, and access can vary by account, platform, region, and organization policy.