I went to reconcile months of a credit card account. (General comment: I have to visit The Skrooge Handbook, because there isn't an obvious Go > Reconcile or Tools > Reconcile command, and the two arrow view-refresh icon "Switch information" in the operations view doesn't sound like reconciliation.)

Anyway, in Reconcile mode instead of Final balance the line shows Total amount, and it has an odd empty drop-down:

The Skrooge Handbook doesn't show or mention this modified display. I don't recall seeing it before but the code has been around since a 2014 "Defered credit card management" commit, so maybe other accounts I've reconciled haven't triggered this. I'm not clear what the account drop-down is for. Is it so you can move transactions (what Skrooge calls "operations") into a different account? Does this transfer happen as you change the status of transactions to "pointed", or when you click the happy ✓ "Validate pointed operations" checkmark?

FWIW, when I reconcile to a paper statement, my model is:

• File > Import > Import... transactions (what Skrooge calls "operations") that I've downloaded from the financial institution.
• In Operations view look for each transaction I've manually entered, look for its matching imported transaction, select both and choose right-click context menu > Merge imported operations
• Clean up payee and comment for imported transactions by searching for some text, selecting transactions, and changing Payee and Category. E.g. search for "KINDLE SVCS", select, change Payee to "Amazon Kindle", Category to Entertainment > Books and Magazines, and click [Modify]. (I believe there are ways to automate this cleanup of imported transactions.)
• Click the refresh arrows to "Switch information" to Reconcile mode
• Enter the final balance from the statement in Final balance/Total amount, which is close to the input field's tooltip "Last balance on your account record"
• For each transaction in my paper statement, find it in the Operations view and click the Status checkbox column for each transaction to change it to "pointed" (what I would call "Marked").
• When it matches, click the big ✓"Validate pointed operations" button, enjoy the happy tune, and repeat for the next printed statement.