Yes, this is annoying. There is a workaround and that is by importing a settings file. For example, I needed to update a folder location for an existing container. I exported the container settings to a json file. After exporting, I made the changes and imported it back in.
The section looks like this:
"volume_bindings" : [
{
"host_volume_file" : "/homes/user/location",
"is_directory" : true,
"mount_point" : "/drive",
"type" : "rw"
}
]