How to keep the font size when resizing text boxes

There are two types of text box in Keynote, preset and custom;

1 - a preset text box (which uses a text placeholder) has the shrink text to fit option,

they are contained in the built in themes on the master slide

2 - a custom text box (which does not use a text placeholder, it is a normal text box) does not have the shrink text to fit option, they are created by inserting a text box using either;   Insert > Text Box or clicking the text button on the tool bar

If you do not want to use shrink text to fit in your presentations, either add a custom text box to the slide, or create or amend an existing master slide to use custom text boxes.

Hi jacquesnorris1980,

Thanks for the post in Apple Support Communities. I understand you have a question about a setting in Keynote.

It sounds like you're referring to the "Shrink text to fit" box, which can be found under Text > Layout. Try unchecking that box to see if this clears things up for you.

Best wishes!

Hi jacquesnorris1980,

Thanks for the reply. To clarify, which exact Keynote and macOS versions are you running?

It sounds like you're sometimes seeing "Shrink text to fit" but not always, correct? Have you noticed any pattern as to when the option appears? For example, when you try to modify pre-existing text blocks, when you add new text, or whether it happens when using a particular type of Header or a specific Keynote template? These might help to narrow things down a bit.

Take care.