Hi and welcome to the forum
Application programs for the most part (other than the Windows built-in apps such as Calendar, Clock, and Calculator) must be installed upon each User Account in order to use them. This is also true for Microsoft Account Login in W10 just like your Local Accounts. If you setup any of your Local Accounts as Standard or Limited Accounts, you can still install programs on these types of User accounts, but you will get a popup box on your display from UAC (User Account Control) asking you to enter your Local Login Admin account password in order to do so.
Hope that helps!
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