Is there a way to change the default text format for the field name when adding fields into the layout
This depends on the theme used. You can, of course, change the style for that object and save as a custom style and even make a custom theme. It will not automatically change on all layouts. You will need to change the theme (or change the style) on old layouts and choose your theme for new layouts.
Click once on any "label" added when you place a field on a layout. Then open Inspector, Appearance tab. There you should see "Text" under the Theme and Style.
Read up on creating and saving custom themes. There are several topics in FM help, on this forum and including videos.
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