To be honest I would not worry about what System Analyzer is reporting re. memory leaks; it is just a baseline tool & given the app or app(s) that are likely to be reported as such, i.e., explorer, Firefox, Opera, etc., there is nothing that one can do about such leaks other than report them to the author of the app(s). And given that explorer.exe is a Microsoft product it is unlikely that Microsoft will do anything about it.
For information the explorer.exe process is the user shell for Windows, and is used by such items as the desktop, File Explorer, Start menu, and taskbar. So if your system is running fine/as per normal then I would just ignore what the System Analyzer says in relation to this.
As for Chrome, it’s notoriously bad for handle leaks and proper memory usage. There’s an option iirc that you can tick off on the settings that doesn’t allow it to run in the background even when you’ve fully closed it.