Run a tight floor. Catch every dollar that walks.
Reconcile the drawer, log the voids and comps, track waste and walked tabs, and run your opening and closing checklists. The shift system that closes out clean and shows you exactly where the money walked.
Reconcile every drawer.

Count each register against what the POS took, and Bar Cop shows the cash over or short the second you close the drawer. Drop in your POS cash or drawer report, or reconcile by hand if your POS has none. Track it by shift and by person, so a short till stops being a mystery.
See who's running up the comps.

Log every void and comp with the reason and who authorized it. Bar Cop totals them by server and by manager, so the free rounds and the after-the-fact voids show up on a report instead of hiding in the POS where nobody ever looks.
Log the waste so the variance is honest.

Write down the broken bottle, the blown keg, the dropped tray, as it happens. That waste flows into your inventory variance, so a short count reads as real waste and not as theft you go chasing when nothing was actually stolen.
Track every tab that walks out.

Log the dine-and-dash and the unpaid tab with the amount and the server. Bar Cop keeps a running total, so you know what walked out the door this week and whether it is one bad table or a pattern in one section that needs a closer look.
Open and close the same way every time.

Run your opening, closing, and side-work checklists off the phone and mark each one done. Build the lists once by position, and Bar Cop shows you what got finished and what got skipped on every shift, so nothing slips on a rushed close.
Line up before the doors open.

Pull up the shift and Bar Cop lines up the cover forecast and the best-margin items to push for that daypart, each with the reason to sell it. Run the briefing, mark it held, and the whole crew hits the floor pointed at the same money.
Your whole service week, in one read.

Every drawer you reconciled, the voids, comps, waste, and walked tabs you logged, the checklists your crew finished, and what the week turned up: sales, covers, cash over-short, and the comps that added up. The whole shift week on one page, so nothing slips between closes.
One section. The whole service.
From the weekly close to the floor logs, every shift tool in one place.