You mean the window on the left, or the UI in general? It's all mostly just heavy edits to default windows with several new ones for stuff like Defend/Row, MP cost in the skill window, changing gear, showing statuses when targeting, etc. The window on the left, if that's what you mean, is essentially just Window_EnemyList (the one that appears when targeting an enemy in the DBS) with any interaction bypassed, just always on display.

Are you familiar with RGSS3 at all? I could just give you my script but it probably wouldn't work right as I have a lot of windows behaving in non-standard ways. I also need to know what other scripts you are using. Are you using Victor's Target Arrow or a similar script to accomplish your targeting?

I'd start by copying Window_BattleEnemy, and then making a new window class. Something like Window_EnemyList (I got the names backwards in my last post, sorry about that). From there, you can just go to Scene_Battle, and have that new window be shown all the time. If you need help with setting up the window, let me know, though I'll admit I'm a pretty lousy teacher, haha.