How to change rewrite from 10 seconds to 1 second?
Is the problem still happening if you select a different video output (preferences -> general -> video) or if you turn off hardware decoding?
Preferences -> Interface -> Seeking, short jump. You may also need to enable the option "precise seeking".
Sorry, I can't still reproduce the problem even turning that option off. Maybe it may happen if you're using a very old version of mplayer.
I'm afraid I can't reproduce this problem in my computer.
The floating control only works in compact mode when using the "basic GUI", as already explained by the dialog help text. It's not a bug, it's implemented this way.
Can you play that DVD using mpv alone?
Install the latest version of SMPlayer (17.7), select the option Audio ->Filters -> Volume normalization. Now SMPlayer will use the acompressor filter instead of drc, as mpv recommends.