I ran into an interesting problem last night. I was trying to upload a manuscript to KDP, and it returned a ton of errors. It required me to shift the gutter (inside margin) which I did, and then I still had a ton of errors. The new errors, however, were all caused by a single letter, f. In a given text frame, whenever f was on the inside margin (i.e. on the right side of the left-page of a spread) the f extended outside the text frame just enough to trigger KDP to say it was outside the margin. There is an alternative glyph for f which is a bit narrower which helps (although I'm not sure if it still passed the text frame - I had already shifted the frame over a bit). However, one case had no easy fix, where there was an italic f on the left side of the right-page of a spread. In this case the bottom of the f went way outside the frame, and the alternative glyph didn't help at all.
I think it would be helpful for both f and italic f if there were variants that did not pass the text frame on either side. That might require two variants for the italic f (one that doesn't pass the left side of the frame, and one that don't pass the right side of the frame.
After a bit of searching I found this is a known problem with the letter f in many fonts. Its kind a of a stupid problem since it's KDP being overzealous about margins, but having alternates to quickly fix these issues would save a lot of work when running into this issue.
I ran into an interesting problem last night. I was trying to upload a manuscript to KDP, and it returned a ton of errors. It required me to shift the gutter (inside margin) which I did, and then I still had a ton of errors. The new errors, however, were all caused by a single letter, f. In a given text frame, whenever f was on the inside margin (i.e. on the right side of the left-page of a spread) the f extended outside the text frame just enough to trigger KDP to say it was outside the margin. There is an alternative glyph for f which is a bit narrower which helps (although I'm not sure if it still passed the text frame - I had already shifted the frame over a bit). However, one case had no easy fix, where there was an italic f on the left side of the right-page of a spread. In this case the bottom of the f went way outside the frame, and the alternative glyph didn't help at all.
I think it would be helpful for both f and italic f if there were variants that did not pass the text frame on either side. That might require two variants for the italic f (one that doesn't pass the left side of the frame, and one that don't pass the right side of the frame.
After a bit of searching I found this is a known problem with the letter f in many fonts. Its kind a of a stupid problem since it's KDP being overzealous about margins, but having alternates to quickly fix these issues would save a lot of work when running into this issue.