The Boox Launcher called apk=com.onyx does not have a regular settings menu, you need to install an alternative launcher (e.g. aio launcher) to access it. If you accessed it go onward.

1. Go to Apps > Menu > App Management and activate USB debugging
2. Make sure you have ADB installed on your computer
3. Connect the e-reader to your computer

Use this command to list all Google and Boox related Apps to a text file.

adb shell pm list packages -f > bloatedapps

Then delete them with:

adb shell pm uninstall -k --user 0 com.onyx.gallery

These are all onyx apk's:

com.onyx.clock
com.onyx.calculator
com.onyx.gallery
com.onyx.android.ksync
com.onyx.easytransfer     # called BOOXDrop
com.onyx.kreader
com.onyx.floatingbutton   # called NaviBall
com.onyx.voicerecorder    # called Recorder
com.onyx.kime
com.onyx.mail
com.onyx.android.onyxotaservice
com.onyx.latinime
com.onyx.tscalibration
org.chromium.chrome       # called NeoBrowser

These are the invisible google apk's:

com.google.android.syncadapters.calendar
com.google.android.gms.location.history
com.google.android.apps.restore
com.google.android.partnersetup
com.google.android.gms.setup
com.google.android.email
com.android.email
com.android.egg
com.android.bips
com.android.protips
com.android.vending
com.android.documentsui

Don't delete com.onyx and obviously not the screensaver app, otherwise they will cause a abnormal pattern.If you did, reinstall with

adb shell cmd package install-existing com.onyx