Google Analytics is changing and it is a bit confusing. I will try to clarify it for you. As far as I have gone, evolution has been:
1.- "App + web property" (Beta phase)
2.- "Universal Analytics" (*) (until 14-Oct-2020): It is identified because the account number is preceded by "UA-" eg. UA-123456789 (Attention, sometimes it is not very obvious and you have to create a new user to see the UA prefix). This option is only suitable for the monitoring and analysis of Web pages and has the option of analysis using "Views" enabled. If you don't have it, you should:
2.a.- Create a new "Property"
2.b.- "Show advanced options"
2.c.- Activate "Create an Analytics Property"
2.d.- Create only one "Universal Analytics" Property
3.- "Google Analytics 4": It is identified because the account number is preceded by "GA4-" eg. GA4-123456789. In this case, the analysis is not done through "View" but through "Data Stream" (** incorporating a series of improvements) although Google offers the possibility of creating two "Properties" one in UA format with Views and another in GA4 format with Data Stream
In all cases, you must place the corresponding gtag provided by Google Analytics within the tag of the page you want to analyze.
Sources
(*) https://support.google.com/analytics/answer/10089681?hl=es&utm_id=ad
(**) https://support.google.com/analytics/answer/9216061?hl=es&utm_id=ad
https://support.google.com/analytics/answer/9367631