Same happened to me. I had one build on my profile page and only because it was "showcased" otherwise it would've been empty.
Here's how to find your base game creations. Took me a bit to figure out how.
At the left of your catalog page, scroll down to "ADVANCED" and look for the greyish tab "Show All" with a small arrow pointing down. Click on it and select the option "Show Base Game"
Honestly EA please put everything back the way it was. I haven't uploaded since Mar 17/26 because my stuff gets buried. PLEASE put back the "newest" filter. I'm already sick of looking at the 10+ years old same "most popular" items.
Not too many people know how to find their stuff anymore either. Please read Reddit comments. I follow 32 people and only 3 are still uploading. It's so lonely, boring and quiet on the gallery now.
Is that the intent of all this or were you really honestly trying to do what you thought would improve our gallery experience?
I log in every morning to check the filter and when I see it's still set to "most popular" I exit the game w/o saving.😢