This settings controls whether the thumbnail views are cached. If you enable this setting, thumbnail views are not cached. ...

This settings controls whether the thumbnail views are cached.

If you enable this setting, thumbnail views are not cached.

If you disable or do not configure this setting, thumbnail views are cached.

Note: For shared corporate workstations or computers where security is a top concern, you should enable this setting to turn off the thumbnail view cache, because the thumbnail cache can be read by everyone.