Sorry, but I can't follow your explanation... I don't see any difference in the font size from the search field and the suggestions list. The list is using the general font size from body. The input field (.form-control) has an extra definition for font-size: 1rem (the same as body). Only if you change the definition for the input field the font size will be different.

It is not about the suggestion list font, it is about temporary substitution font while you hovering over the suggestion list. I have no idea where this temporary substitution takes font parameters from as DevTools is of no help here, and it is not only about font size, it is about the font family too. I have described above how to reproduce the issue.

I can't replicate the behavior you are describing.

I can't replicate the behavior you are describing.

I have just checked it again with Cassiopea default template. Try to enlarge font for the search field to see the difference clearly via DevTools (font-size: 20px) or via css:

.com-finder .input-group .form-control { font-size: 20px; }

The issue arises when you have something already typed in the search field, open suggestion list after and hover over the suggestion strings. Every time you hover over a suggestion word it is temporarily put into the search field with its own font parameters, replacing search field font parameters of the site template.

Every time you hover over a suggestion word it is temporarily put into the search field

I cant replicate this - even after setting wildly different styles for the input and the suggestion

Closing as non reproducible.