DavidR
2
- Once you set avast as your screen saver I believe you can pretty much choose other screen savers (image1), I don’t use it, but there is Windows XP (my OS) that is pretty much black (image2), obviously you don’t have XP. You can choose My Picture Slideshow, which you would have had to have pre-set a folder in the standard screensaver setup (image3).
Now all you need do is select the folder to use and populate it with a black image, etc. it is just being a bit creative if you just want black.
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As its name suggests once the scan completes it will restart the scan.
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The avastUI, Settings, Exclusions are for all on-demand scans and that would include the screensaver scan.
The resident scanners are not included in this global setting.
system
3
Really? The note reads: “[these exclusions] will apply only to on-demand scans (manual and scheduled)”. No mention of the screen saver. I wouldn’t qualify the screen saver as “on-demand”, since the user doesn’t control when it happens. Also, if Settings->Exclusions applies to the screen saver, why is there a separate exclusion list in Screen Saver scan->Settings (blue link)->Exclusions? (enable Screen Saver in the GUI to see its settings).
DavidR
4
The screensaver is user initiated, e.g. you have to create it, it won’t run of its own volition. So I certainly wouldn’t class it as on-access as nothing is opening this files that you are scanning with the screensaver scan.
The Scan from Windows Explorer also has Exclusions but the Global Exclusion also covers that also, as it too is an on-demand scan.
I don’t know why the duplication is there, perhaps it is more to do with the all of the scans in the Scan Computer being on-demand scans and the AvastUI, Settings Exclusions avoids having to enter exclusions in every one.
system
5
I have already noted many times here that the “Loop” choice of wording sucks and lacks proper description/documentation. Wrt exclusions, proposal already takes to $elsewhere 
DavidR
6
I have never felt that when loop is used in conjunction with scanning and there are plenty of definitions that could fit the bill, but this one specifically relating to computing is best.
[b]loop[/b] - (computer science) a single execution of a set of instructions that are to be repeated.
However, the screensaver section of the Help Center could do with expansion as there is nothing about the options/parameters.
It’s a pity that the C:\Windows\System32\scrnsave.scr is not listed into avast ones…