Vmware 14 workstation, How to increase disk size of the virtual Ubuntu 18.04 server?

Hello,

I am running an Ubuntu 18.04 VM. I had alloted 20gb as the disk size initially. Then I increased the size through settings to 30 GB. But this isnt reflected in the VM , which still shows 20 GB.

So how do I effectively change the disk size without losing any data?

Thanks for any answers!