Hi @Natessa and warm welcome to the community.
I appreciate your message, and I'm sorry to hear that you can't delete the apps that you installed but not showing up on your gallery.
May I suggest you to read and follow the steps shown in the following help article ? How do I remove apps from my Fitbit watch?
If you experience troubles, please see How do I set up and troubleshoot apps on my Fitbit device?
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