I have had the same problem recently. Answer unfortunately wasn't obvious and easy to find. There are some scripts on the internet but has worked form me. Below i am presenting to You script which You can paste into any file with reg extension and run. After that You will be able to run powershell with admin privileges from current open folder (You have to hold shift and then right click on empty space in folder.
Code:
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\Directory\Background\shell\PowerShellAsAdmin]
@="Open PowerShell window here as administrator"
"Extended"=""
"HasLUAShield"=""
"Icon"="powershell.exe"
[HKEY_CLASSES_ROOT\Directory\Background\shell\PowerShellAsAdmin\command]
@="C:\\Windows\\system32\\WindowsPowerShell\\v1.0\\powershell.exe -windowstyle hidden -Command \"Start-Process powershell -ArgumentList '-NoExit', '-Command cd %V' -Verb runAs\""
Context menu view:
