So what you're describing is the Windows 10 Mail app which has your Hotmail account configured. For the record, there was no mention of anything disappearing in your original post asking about the "View tab"
In any case, just to be sure that we're on the same page, have attached a 2 part screenshot of the Win10 Mail app
#1 - Shows the emails in this example, it's showing emails as these exist in my <Focused> <Inbox>
#2 - Shows how you would display all folders that exist in this account which is done by clicking on <Folders> in the left hand pane. The folders appear in the right-hand pane. If you want to see the contents of a given folder, you just need to click on it
Now to get to the issue you added in the previous response - the "missing" folders or emails. To that end
#3 - Do the folders you're expecting appear after performing the steps in #2
#4 - If the answer is no, when you log into your Hotmail account via your browser, do you see the folders there? If no, is what you're looking for appear in the <Deleted Items> folder or the <Recovery> folder?
WIthout a complete picture of what has transpired with your account, impossible to provide an answer as to why things are missing. When was the last time you had this data or to ask this another way, was this something that was there yesterday but not today?
Please note that I'm shortly going offline so may not respond immediately to any reply but rest assured that you will get a response when I get back online (am on Eastern Daylight time - GMT-5)