How do you reconcile the bank statement with opening and ending balances ?

Well, there isn't true reconciliation in Simplifi. Since it works (as Mint did for example), by taking the balance from your bank's website and subtracting any pending transactions to calculate the Balance. Thus unlike MS Money or Quicken Classic, the balance should always be right.

So you have to employ a workaround.

Some people use the Review checkmark as a replacement. When they get their statement they go through and check the review box for each one. If they find a missing transaction, they enter it, clear it and check the box. In that way, they "reconcile" the statement.

I don't bother to do that with my connected accounts. I just check the transactions as they come in to show that I reviewed it and I accepted it was a transaction I made. I also enter my pending transactions manually for accounts that don't download them.

What I do instead is periodically check to make sure I haven't missed any transactions by confirming the total amount of my transactions with the balance that Simplifi shows. It works with any account and not just connected ones (though theoretically with the new feature to "re-sync" manual accounts it shouldn't be necessary for those since the re-sync re-totals the transactions).

For this to work, you need to have set a beginning balance for your accounts (unless of course it was $0.00). Here's a screenshot of my "reconciliation" of my Apple Cash account:

Here you see that my downloaded balance of $167.93 equals Simplifi's total of all my 306 transactions, which I chose using the selection button on the far left. Note that I first sorted the account by category. You could choose another column except date. This sorting forces Simplifi to open up all the transactions so you can choose them all at once using the selection box in the column header.

Now I have confirmed that I am not missing any transactions. I do this with all my connected accounts from time to time.

Hope this helps.