@Adanac93, Thanks for posting in Q&A.
From your description, I know you want to know something about Intune management.
Based on my research, when you remove or uninstall company portal from your personal device and unenroll Intune, all ties to your company for potential data exchange are cut, the employer does not have access to any data, location tracking, seeing which apps are installed on your device. However, if the company device installs company portal and enroll it into Intune, then the employer can access to data, track location of the device, check which apps are installed and so on.
Hope this can be helpful. If there is any update, feel free to contact me.
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