[GNC] Reconciliation "R" column question

[Fran_3]

In Help 2.94 Reconciliation... "R" column choices are...
n = not cleared the bankc = cleared the bankr = Reconciled
I've got the GnuCash Check Register open in one window and I'm logged on to the bank in another window looking at recent transactions...I'm trying to make sure each bank transaction has been entered into GC.I'm not doing a formal monthly reconciliation... this is just an end of day check up.

Question 1: May I freely change "n" and "c" back and forth while looking at the check register?Question 2: I understand that if you enter "r" in the "R" field it is hard to change back... true?
Thanks for any help.