LibreOffice 6.2.7 works fine in the administrator account, but not in the user account. Most software opens in the user account by just selecting the shortcut, but LibreOffice requires using the password protected Run As Administrator function, which is an annoying inconvenience.
This is not true to my experience - that’s why there is a user profile in users %appdata% directory. There must be something wrong with your permission settings.
Can confirm what @anon73440385 wrote, works fine in Windows 10 (1809) with a normal restricted user account. No UAC request, it simply starts as expected. (LO 6.2.3.2)