Surely to goodness, there must be a better way of signing in using a remote control. It's tedious beyond belief! Also, I am now being asked to put in a word as part of verification but there's no keyboard function so I can't! Why can't you tick to save username at least...
In all fairness I don't think a single device with multiple accounts is the ideal setup. Logging in to most services is a pain, but generally you only have to do it once. Your arrangement may suit you best, but the constant login/logout process has to come with that.
No, read what @redchiz1 actually said, which was to have a second device with Now on it, plugged in to your giant TV.
Then neither of you has to log out, you just choose your particular device to watch Now from.
I have an LG TV with Now on it, but I need to use a Roku Express to get All4, and the Roku also has a Now app on it. So if my wife’s tastes differed more dramatically from mine than they do, we could each have our own account, one on each Now, and never have to log out at all, just to choose which device we started Now on.
Recently, though, Now have started using QR codes, which many sites use as part of an easier login. But Now, bless them, haven’t thought to do this for existing members, and are using it just to encourage sign ins from new members, when it could perfectly well fulfil both functions.