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The Layer Toolbox displays for me with the "Style" subsection improperly formed, the "0px", "1px", "2px". "NoCross", "CRoss", "Simple" and "Marked" are stepping on each other (see pic). Also, the window will drag-resize in the X direction but not in the Y direction - I feel these may be related as the components' (mis)placement is in the Y direction and the window evidently can't grow to accommodate? This is 0.26 on Ubuntu 18 w/ dual 4Ks, the window is messed up on either monitor.
My Windows version does not have this problem, the Layer Toolbox window expands or contracts to fit the enabled sub-panes. It also does not offer Y sizing, but that's OK because it knows to do the right thing.