The reconcile option is a tool that just helps ensure your QuickFile bank account matches your actual bank account. It doesn’t add or remove any entries, it’s mainly just a matching exercise. There’s a few more details on this here:
You’re correct in regards to be export option - it is limited to just what you see (at most, 50 transactions). But you can get a full export of the bank, amongst other data, by running an account back up. Please see the below for instructions: