In Start Search type gpedit.msc to open group policy editor tool
Navigate User Configuration => Administrative Templates => Windows Components. Then in the Right Pane Double-Click on File Explorer.
Now Scroll Down and Double-Click on Remove File Explorer’s default context menu.
Now Remove File Explorer’s default context menu dialog box will prompt. Then Select Enable Radio button. Then Click on Apply and then OK.
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The show or no-show of search box and search button on Taskbar is controlled by the 32-bit DWORD registry value named SearchboxTaskbarMode in the following registry key:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Search
The possible values corresponding to the options above are:
Disable: 0
Show search icon: 1
Show search box: 2
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Open Group policy editor by typing Gpedit.msc and hit enter key.
User Configuration\Administrative Templates\Start Menu and Taskbar\
Double-click on the policy-setting named “Prevent changes to Taskbar and Start Menu Settings” and it will open up in another window. Now change the toggle option from Not Configured to Enabled.
Click OK