Wanting to have a larger window but not full screen with the web player, I decided to poke around a bit using Chrome's "inspect element" and have found I can resize the viewer to anything I want.
Steps:
With the web player open, right mouse just outside of the web player window.
The DevTools window should open pointing to this element:
Click on the element below it...
You can edit the "lg" at the end to "xl" to get a slightly larger screen. However, if you then look at the styles pane, you will find this:
media (min-width: 992px)
.modal-lg, .modal-xl {
. max-width: 800px;
}
Change the 800px to whatever maximum size you want...perhaps 2000px. That lets the modal window grow up to that size if the browser window is large enough for it. Then, when you stretch the browser window, the web player will stretch with it, up to that size.
This should be an easy change for the Devs to make permanently so that the browser becomes stretchable.