Windows user's profile is a set of files and directories where user's program settings, desktop settings, HKCU registry branch and many more parameters allowing for personalization of user's work environment are stored.
LABS domain, every user has his own directory assigned, where profile files are stored (that's
\\files\profiles\<username>.v6 for Windows 10 i
\\files\profiles\<username>.v4 for Windows 8.1). Disk limits ("quota") are imposed on that directory. Details about current disk quotas are to be found in WMI Panel.
Profile on its own - so settings which are stored in those files - is limited on operating system level.
If you have problem with your profile, visit Profile issues.