Just thought I'd mention that you can access the Equalizer by going to File >
Preferences > Playback > DSP Manager, then adding the Equalizer to the left
column and clicking the 'Configure selected' button at the top of the column.
This brings up the Equalizer window and all sliders are functional, and
resizing seems to work okay as well.
The downside is that you can't close the Preferences window so you'll need to
move it out offscreen or something, but in my experience having both the
Preferences and Equalizer open doesn't impact your ability to interact with the
main app window.