larry - the button size used to be set in window menu control bars - but i don't think it works anymore in the new dark UI [all greyed out when i try it anyhow and the option if it works is very limited]

I know of no way to lock the bars - used to be able to save the layout using xareg [I seem to recall] - but that does not appear to be in the current version, unless i missed it [or am using the wrong version]...