Hi @IBN
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According to the picture, we'd like to recommend you involve your admin to check if this feature is disabled from the Teams admin center.
In Teams Admin center, admin navigate to Meetings > Meeting policies > Global > General > check if the Allow scheduling private meetings option is turned off. Turn it on will enable you create the private meeting, but it depends on your organization's policy. If this is the case, please seek the further help from your admin.
For Screen sharing issue, have you checked if this user has the same problem in Teams web client? There are times when you are unable to share the screen just because the screen sharing mode is disabled. Here is how you can enable the screen sharing mode on Microsoft Teams:
- Go to the Microsoft Team’s Admin center and click on Meetings.
- Select Meeting policies and click on Add New policy.
- How to Fix Can’t Share Desktop Screen on Microsoft Teams on Windows 10
- Provide a unique name and description for your policy and select Next.
- Now, locate the Content sharing option and click on the drop-down menu against Screen sharing mode.
- Select Entire screen and then try sharing the desktop screen on Microsoft Team
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