Colonel Failure

Hello When I try to create a sparse file container, I cannot find any corresponding options. Furthermore, the System menu and e.g. options to resize a volume, are not present in the gui under linux (min 19.2). Using the command line parameter --quick will not help (as I understand, this only works on devices, not on files). So please, is there a way to create sparse containers under linux? if not, please understand this as a feature request ;-) Sincerely, Hans