Can open decorations menu after beating mini-bosses

I was in a mini-boss fight and killed them (where you find the portal on a realm and it takes you to a boss fight) and was able to go into decoration mode in there and have all the options I would as if I was in the castle

Thanks for the information!

No problem. Happy to help.

The same thing happened to me, but it was on a boss floor. I hadn’t killed the boss yet, and noticed it as soon as I entered the floor.

I couldn’t edit the wall/floor/background (I could select the option but nothing would change visually), but I was able to place decorations such as a pillar down.