It was a server I found because of a Youtuber that played on PvP Legacy (can't find his channel or name either, but it's not any of the "affiliates" on PvP Legacy's site). The PvP and items they had were from the version 1.14 until the most recent version, which at the time was 1.21.2 I think.
The hub/lobby, whatever you want to call it, was INDOORS, a compact lounge with sofas and black/purple/neon decoration.
The UI was a custom texture pack, VERY similar to CubeCraft, almost identical, but somehow even more Bedrock-coded.
There was a smartphone item you could use to check your friends, shop, play minigames, etc.
The main modes I remember are the Capture Point one (the most popular iirc), where you and your team had to pick classes (one had a crossbow, the other had axe and shield, etc, the usual PvP kit stuff), and only a specific amount of people in your team could be each class. The other mode was one of those minigames where you have to fit inside the different wall shapes that come from a direction. Pretty sure there were many other modes and minigames but those are the two I remember the most.