Thank you for your answer and question.
Currently I am using OSMC on two setups.
The first and most used one, is the one that demands video calibration everytime I reboot or just plainly powerdown or exit (both at the power menu).
The other one doesn’t present these issues, but then again that one is not connected to a standard old CRT television with PAL 4:3 layout, like this troubled one.
I can’t even configure that 1:1 setting that you mention. (Could it be) Because I don’t even know the whereabouts of its remote control, (where I could, perhaps, use it to unlock and access more advanced settings inside the TV device menu), and besides, when I try to access the setup option from the standard 6 keys that are at its footer panel, on the menu I get ‘Not available’ displayed as an answer.
Perhaps the TV set is locked…
But maybe this is not that important.
What indeed matters is that, previously, with other versions of OSMC, I could do that video calibration and the setting would stick throughout reboots/powerdowns/exits in the power menu…
Hope I managed to answer your question.