Hello
Thank you for your question and reaching out. I can understand you are having query\issues related to Control Panel not accessible.
If this is your Company Domain joined computer then it can be due to Group policy applied which blocking access to control panel.
If this is your Personal or Non Domain joined PC then to enable the Control Panel:
Go to > Open User Configuration > Administrative Templates > Control Panel
Set the value of the Prohibit Access to the Control Panel option to Not configured or Enabled.
Click OK.
--If the reply is helpful, please Upvote and Accept as answer--