The language here is slightly confusing. Are you saying you want the ability to remove an art asset without logging into the VTT itself, so somehow do this from the Game Management pages? If that is the case, then no, there is not a way to do that. However, if you are talking about being logged into the VTT, on a particular Page, and selecting and removing an art asset, that is doable. The question then remains: Are you talking about an object on the map layer? Switch to the map layer, click on it, click delete. Are you talking about an object on one of the layers that has gotten dragged off the view of the page where you can't click on it? Go into the page settings, make the map dimensions somewhat larger, on the layer in question, select everything with ctrl-a / cmd-a, then drag them to the right and down until the item you need is exposed. Select the item and delete it. Hit ctrl-a / cmd-a and drag the items back to the top left, then size the page back to where it was. You might find it handy to add an object in the upper left corner first, if you don't have one, so that you can get the alignment back precisely where it was. Rinse-Repeat for each layer where there is something off the board.
