From 2016.3 and above, you may use administration in Worspaces/BridgeIT to manage analyst and enduser. So below issue will not happen.
For more information, please refer to: Announcing Service Desk 2016.3
User management search field is disappeared in console administration. It looks like below:
The default scale of windows is not 100%.
Open Control Panel - Appearance - Display, use the default size which is 100% and this issue should be solved.