By default, macOS'es Quick Look functionality caches previews of all files, even those found on file shares or encrypted file systems. This may not be what you want. Fortunately, you can disable Quick Look caching.
Open Terminal and type in these commands:
qlmanage -r disablecache qlmanage -r cache rm -rf $TMPDIR/../C/com.apple.QuickLook.thumbnailcache
If you want to set the Dock size in macOS to a specific value, you can use the Terminal to do so:
defaults write com.apple.dock tilesize -int 32; killall Dock
This will set the icon size to 32px, and then restart Dock. To get the current value of the Dock size:
defaults read com.apple.dock tilesize
There's no proper uninstall tool for Office on Mac. To completely uninstall Office for Mac, follow these official instructions:
If you're not ready/able to upgrade to macOS Catalina, you can hide the update from Software Update.
Note that because of sudo, you'll need to be an admin on your Mac.
Open Terminal and enter the following command:
sudo softwareupdate --ignore "macOS Catalina"
Enter your password when prompted.
When you are ready to update, you can un-hide Catalina the same way:
sudo softwareupdate --reset-ignored