over 6000 variations of a single font listed

I am using a MAC with the Sonoma 14.3.1 system. I have imported a complex document into InDesign 19.4. from Microsoft Word. Its bold, italic, all caps formatting must be preserved, but I want to change the base font from Times Roman to Brigade (available in Creative Cloud). When I went to Find/Replace font over instances of 6000 Times Roman fonts were listed, with the Bold or Italic, etc. repeated incessantly. It's as if each instance is a distinctly different font.

If I select a group of them to replace, the number of fonts goes down by one, no matter how many have been selected. (See screen shotsb elow)/

I tried using "change format" but most of the Times Roman did not change.

In addition, some of the formatting is lost when I import. An entire line that begins with a bold word becomes bold in InDesign, when only the first word is bold in Microsoft Word.

Are there settings I should impose to solve these problems? Maybe I'm stuck with Times Roman. But I don't want to go through this lengthy document to fix the import errors, either.