Hide the "Show me the ad!" pop-up during slicing
Lychee Slicer can show an ad pop-up at the top left of your screen while you slice.
Lychee Slicer Plus and Plus & Library
Go to File → Preferences → Global Settings and turn off Show Ads during Slicing.
Lychee Slicer Lite
Ads are part of the free version and can't be turned off. To remove them, upgrade to Lychee Slicer Plus or Plus & Library. See pricing.