I have worked for similar bosses along those micromanaging types who get hot under the collar because you're not in constant contact with 15 second updates.
One thing I learned that I've stook to for close to the last 20 years - set your boundaries early and stick to them.
The company pays for 40 hours of effort a week. No, that absolutely doesn't include my missing a lunch break, working weekends and/or evenings except by exception. And that is in exceptional cirumstances and guess what? You're paying me for the privilege one way or another, whether in actual overtime or time off in lieu.
No, I won't be reading your emails past 17:30, or at weekends. No, I won't be answering my phone (if it is genuinely urgent and exceptional, leave me a voicemail and maybe text me as well).
Funnily enough, what caused me to adopt that attitude initially was when i joined large global company. During the interviews we agreed my salary and package to both of our mutual consent.
When I got the contract to sign, I noticed that the annual salary was 50 pence a year more than agreed which struck me as odd.
Still being relatively young and lackign in cynicism, I called their HR department to ask if they knew, was it ok, etc. and was told "Yes - that is how our grading structure just happens to work, don't worry about it"
And of course I had no reason to dispute it.
Fast forward a couple of months and I was asked if I'd work a weekend. Yes, sure, said me.
When I came to claim the overtime, I was told "Sorry you can't at that grade".
Indeed - up to £27,000.49p you were eligible for overtime. At £27,000.50p you were no longer eligible.
I told my boss there and then I would never work overtime again. Had they been honest about it, I'd have had a chance to discuss and argue and be aware but given the underhanded way it was handled I wad furious.
It was a bitter lesson learned hard (always make sure everything you agreed and even believe was agreed is in your contract. Always make sure calls etc to HR are followed up by an email) but it was also freeing - I realised you can tell management to suck it and by and large they just move on to someone more malleable.