To show/hide the small iconic badges that appear overlaid on an image’s thumbnail in the Library module (in Grid view), select View > View Options and under the Cell Icons options choose to check/uncheck Thumbnail Badges. To show/hide badges that are overlaid on the image thumbnails in the Filmstrip, select Preferences > Interface and, in the Filmstrip options, check/uncheck Show Badges.
It’s worth taking a minute to look at all of the options for displaying additional information such as Flags, Quick Collection Markers, and Unsaved Metadata in the View Options and Ratings & Picks, Stack Counts, and so on in the Interface Preferences to customize the amount of information that you want Lightroom to display on your images.
Here are a few shortcuts that I commonly use to display various amounts of information:
• Command + Option (Mac) / Control + Alt (Win) + Shift + H hides/shows Badges.
• Command (Mac) / Control (Win) + J displays the View options for the Library (Grid and/or Loupe) and Develop modules.
• Tap the I key to cycle through the Information overlay in Loupe View (the content is controlled in the Loupe Info view options).
• Tap the J key to cycle through the Grid View Style.