SCCM Collection Maintenance Window

I am not sure if I understand your question correctly.

The point is that you can configure more maintenance windows. So you have an option to apply the maintenance window to specific device/user collection. For example, you have daily-shift devices and night shift-devices so you need to configure two MVs.

Microsoft Documentation which explains all about maintenance windows https://docs.microsoft.com/en-us/configmgr/core/clients/manage/collections/use-maintenance-windows 

I mean if you have Maintenance Window for a Collection  1am - 4 am
If you have Software Update or Application deployment scheduled  between 12am- 2am, then the  install will still happen.
To my understanding Maintenance Window controls the Restart, as indicated by Microsoft on the link below:


 https://docs.microsoft.com/en-us/configmgr/core/clients/manage/collections/use-maintenance-windows  

By default, computer restarts caused by a deployment aren't allowed outside of a maintenance window, but you can override the default.

Though it does not talk about how to override it.

Though it does not talk about how to override it.

It doesn't, however, I provided a screenshot in one of your previous questions how to ignore a maintenance window.
https://www.experts-exchange.com/questions/29176486/SCCM-Installation-Dealine-mismatch-with-Maintenance-Window.html

The best way to get all the answers is to test it yourself. This will give you much more than theory.

Example:
MV is set between 1AM-4AM
Deployment is scheduled between 12AM- 2AM
= the deployment waits till 1AM, then the installation will start

Where do you see this :

in Deploy Software Update Wizard , I see this:

Thank you

I can see it:

I meant this one, where do you see it:

Thank you Guys

No problem!