Did some testing on this and it seems some of the choices have a bigger font or something. Test both English and Italian version. For Italian it was two of the options for me, for the English I found one that's not as bad as the Italian but also not good.
(Edit. No need EVER to apologize on how you speak a foreign language. Your englisch is just fine)
Product: The Sims 4
Platform:PC
Which language are you playing the game in? English
How often does the bug occur? Every time (100%)
What is your current game version number? 1.70.84.1020
What expansions, game packs, and stuff packs do you have installed? Get to Work, Get Together, City Living, Cats & Dogs, Seasons, Get Famous, Island Living, Discover University, Outdoor Retreat, Spa Day, Dine Out, Vampires, Parenthood, Realm of Magic, Journey to Batuu, Perfect Patio, Cool Kitchen, Spooky, Kids Room, Backyard, Bowling Night, Fitness, Toddler, My First Pet, Moschino, Tiny Living
Steps: How can we find the bug ourselves? Click the Attic Stack Decoration Box, click Select Holiday Decorations, and click Decorate Foundation.
What happens when the bug occurs? The filters (banners, bunting, lights, etc.) are not available for foundations.
What do you expect to see? The filters for foundations should be available.
Have you installed any customization with the game, e.g. Custom Content or Mods? Yes
Did this issue appear after a specific patch or change you made to your system? Neutral/Not Sure
I've been experiencing this issue since I discovered the filters which was probably several months ago. It doesn't have a huge impact on the game, since my sims aren't decorating that often, but it's quite annoying whenever I do have them decorate. I want to be able to jump to a specific type without having to scroll through them all. This bug occurs with or without mods / cc installed.
I can select the filters for other lot features, such as fences.
However, for foundations, it's almost as if the title text is interfering with the filter functionality. You can see the font is quite a bit larger here. It defaults to display all types and none of the others are available for selection.
This is what the text looks like for spandrels.
