Expense ratios on inverse ETF’s

I’m having a hard time understanding how exactly the expense ratio is deducted when shorting with an inverse ETF. I’m using “SH” (Proshares Short S&P500) and I see the expense ratio is .88% which is relatively high imo. I’ve been searching relentlessly trying to get a straight answer on when and how the .88% expense ratio fee is deducted but it makes no sense to me. Normally I believe they are deducted from dividends but there are obviously no dividends on inverse ETF’s. Can someone please explain when and how this will be owed/paid?

Is it .88% of what I’m holding at the end of the year? Is it .88% of every share I bought throughout the entire calendar year?

I see it isn’t automatically deducted after I purchase it but I also read that holding it past 1 day eats into the profit from compounding expenses. I’ve held a small amount for a long period (3 weeks) just to test this out and no money has been deducted from my account or short position yet.

I’m completely lost on when this .88% is owed or how it will be deducted. Any info would be greatly appreciated!