Hmm... so there's no simple way of selecting all captions in one go, eh? I know each style in the S&F pane has the option of selecting all captions with style x in the drop-down menu of each style, but I've got more than one style of caption throughout my document.

Your ability to apply a style to every caption in a document depends on whether or not the existing captions are all of a differentiated style. If, for example, they were all just typed in without a style selected, they will be Normal, as is, presumably, the rest of your document, in which case you have no way of selecting them unless each starts with the word Figure or similar. Depending on other factors in your document, that could possibly allow you to apply a macro that that would select just those sentences and apply the style your want.

However, if your captions are all some style that only the captions have, no matter what it is, you can use Find and Replace to replace a style. Instead of entering text into the Find and Replace fields, use the Moe drop-down in the Find and Replace dialogue box, select Format, and then Style. Select the existing style for Find and the one you want for Replace, and press Replace All.

Best,
Ulodesk

Indeed, Find & replace is usually helpful; you can find formatting and replace with a style name. Or you can find a style and replace with another style.

__________________
Stefan Blom
Microsoft Word MVP

Microsoft 365 apps for business
Windows 11 Professional