Same suggestion as for RSD, remove the pixels sizes information on the slider bar, which will help those that don't fully understand the concept of using breakpoints as a design feature rather than designing for specific pixel viewport sizes, and allow them to concentrate on the design across all devices.
I agree with previous poster though the ability to lock/unlock the breakpoint position would be nice (my hands are not as steady as they used to be and sometimes I also inadvertently move a breakpoint, although it usually is not a lot to cause too much damage to the overall design (thank my God for the message that pops up to warn me about that)
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