You are possibly being presented with the "mobile" view of the VM mail application (your browser detects your screen characteristics and reduces the data to fit on a smaller screen (such as a tablet or phone)). It results in you only seeing the list of Inbox emails initially).
If you are you using a tablet, phone, Chromebook, or some device with a screen smaller than an average laptop or PC, this is most likely to happen. Or, if you open the webmail window in something less than full-screen mode, or have zoom in your browser set to something more than 100%, the same result is probable.
So, clear your browser's cache and cookies (you can Google how to do that).
Make sure your screen settings are absolutely standard (no zoom in browser and no change to your Display settings in Control Panel)
Go into webmail via www.virginmedia.com and you should then get the normal list of folders down the left side.
Why should I have to clear my cache and cookies just because Virgin Media can't be bothered to have webmail which is fit for purpose? I want to keep stuff in my cache. I am only using WM webmail because I am not at home right now. Can't wait to get back to using a proper email client which does what I want it to do instead of trying to second guess what I want or force me to do what I don't want to do. The old webmail was fine. This is the first time I have ever had to use the new one and already I am regretting not having set Thunderbird up on this computer (I wouldn't do that just to send one email).
Why should I have to clear my cache and cookies just because Virgin Media can't be bothered to have webmail which is fit for purpose? I want to keep stuff in my cache.
that is a particularly stupid place to store anything important
A cache is intended to be a volatile temporary storage location only.
if you want to keep stuff, then export it / take a copy / put it somewhere outside of VMs control. that way you don't lose it if when there web mail goes rogue.
there are other badly designed servsise that rely on having somethign save in the cache - Tesco banking used to do it before I ditched them. They did say if you delete your cache we will text you a new security code - but I don't have a mobile- OK we will send you a 1st class letter instead - well OK but I delete my cache daily - can you set that up on auto-repeat..... and that was the end of tesco secure banking for me.
A modern web browser's data cache is not “volatile temporary storage” as evident by the varied type of data held, for instance, media licenses, hosted app data, etc; IMHO, expediency is the reason behind the advice of clearing a browser's data cache.
In computing, a cache/ˈkæʃ/kash, is a hardware or software component that stores data so future requests for that data can be served faster; the data stored in a cache might be the result of an earlier computation, or the duplicate of data stored elsewhere. A cache hit occurs when the requested data can be found in a cache, while a cache miss occurs when it cannot. Cache hits are served by reading data from the cache, which is faster than recomputing a result or reading from a slower data store; thus, the more requests can be served from the cache, the faster the system performs.
To be cost-effective and to enable efficient use of data, caches are relatively small.
Web cache is one of the functions of the Web Browser's data cache and it uses a Least Recently Used algorithm to evicted entries. Instead of clearing the whole data cache try selecting those entries for Virgin Media; AFAICS that is approximately 30 cookies and associated entries in History.