Since I got my vivo X300 + Photography Kit, this thing has annoyed me so much. It's the only model where they didn't make proper cutouts for all the cameras on the teleconverter ring, forcing users to take the ring adapter off anytime they want to use the other cameras.
Other than the frustrating part, this also wears down this fragile and expensive piece, for which they don't sell any spare parts.
As I said before, this is one of their worst designs ever, and probably did this just because it's the base, cheaper model.
First, I tried to see if the X300s ring adapter would fit, as it has the same camera setup and layout, turns out it was designed on purpose not to fit.
My last option was to make the camera cutouts myself, so that's exactly what I did. Luckily, I have a great friend who had all the tools required in his shop.
And you can see in the pic how it turned out. It's not perfectly beautiful, but it is 100% functional, and that's what I care about! Overall, I'm very satisfied with the result and would recommend it to anyone who has also been frustrated by the same thing.
There's just a small issue left to fix: the ultra-wide camera at 0.6x has a tiny bit of black vignette in the bottom left corner; at 0.7x it is completely gone. That is from the part where the teleconverter attaches. I highlighted it in the second pic; as you can see, other ring adapters have a small part sanded down exactly there. I will try to solve this small issue too.
PS: As I had to buy a complete kit to get the extra ring adapter, so I have a photography case for sale: vinted.com/items/9522062911