60hz to 40hz on HP Elitebook 645 G11?

[georgaphymark]

Hello. I have a laptop HP Elitebook 645 G11 with this monitor: LGD0791.
I can only see 60hz available listed on Windows 11 settings, also internet search tells me the manufacturer (LG) lists only 60hz as product specification.
I can only change to 40hz if I use Custom Resolution Utility (CRU) and set up a custom resolution with 40hz, but I am afraid to use it like this long term as I don't want to damage the screen permanently. Is there any possibility that the screen might be damaged if I lower the refresh rate and use it like this? I am fan of this refresh rate, but if it means to stess/strain the monitor then I won't use it.
I have found a PDF with info about the panel and uploaded it with this post. Could you take a look>

Please provide me with insight, thank you and happy holidays!

[ToastyX]

I don't imagine a lower refresh rate would cause any problems.

[georgaphymark]

Thank you for your reply ToastyX. I have been waiting someone to answer me. I was concerned about lowering the refresh rate, because it wasn't mentioned by the manufacturer. I have another question now - what if I download a software program like f.lux to lower the brightness below the usual that can be done with Windows 11 settings - could dimming the screen more than recommended damage it? Thank you.

[ToastyX]

f.lux doesn't change the brightness in the hardware, so it wouldn't affect the screen.

[georgaphymark]

Thank you for your reply ToastyX!