What is the problem?
I just upgraded to 1.4.2 and the feedrate and flowrate sliders aren't there any more.
What did you already try to solve it?
looked for settings, didn't find any.
serial.log or output on terminal tab at a minimum, browser error console if UI issue ... no logs, no support! Not log excerpts, complete logs.)
Additional information about your setup
OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ... as much data as possible