The NFT gallery and dapp connections are disabled in the App Store version of Galleon due to App store compliance requirements.
You can still continue to use Galleon to interact with dapps and NFTs by downloading Galleon for macOS directly from our Github releases page under "direct installs." We update this page periodically with every release. https://github.com/Cryptonomic/Deployments/wiki/Galleon:-Releases
Please reach out if you have questions at firstname.lastname@example.org