App still installs under incorrect account?
Try to forget X-plore in Play store
- Uninstall X-plore
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Choose desired user account in Play store
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Click Manage apps & device
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Select Not installed
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Find X-plore in list, and click Delete button
- Switch Play store to correct account
- Install X-plore
This was Play store will forget association of X-plore with your unwanted Google account, and hopefully install/use it only from desired account.