Global Adaptive Resolution Setting
Add a global setting or button for Fast Previews/Adaptive Resolution. That way users can turn it off globally for an entire project. Currently there is no way to do this except to go in each composition and set fast previews to 'Off (Final Quality)'.
Also, this might be a bug, because for some reason, at a certain moment, this has been turned on and now it is turned on every composition or project I open resulting in a very pixelated preview.

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Luis Medrano commented
Completely agree. I believe generally this setting is not a comp by comp preference but user by user. Therefore it makes way more sense to make this a global setting. I only have these on when I get files from another person and need to manually turn them off for dozens of comps.
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Misha Mazor commented
Same, need setting to turn off Fast Previews/Adaptive Resolution by default
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Matthew Talesfore commented
Why can't there be a preference for all the viewer settings.
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Sheldon Drake commented
well hello 3 years later and suddenly all my comps seem to default back to that little blue button on whenever i return.