You can type PL or go to right-click / Cycle Peak Lables to cycle through four different peak label display options:
Short: Residue Type, Residue Number and Atom Name, compressed where dimensions are the same, e.g. G28H, N or @92H, N or G28H, N; A27CA
Full: Residue Type, Residue Number and Atom Name for all dimensions, e.g. G28H, G28N or @92H, @92N or G28H, G28N; A27CA
Pid: Project ID (Chain.ResidueNumber.ResidueType.AtomName), e.g. A.28.GLY.H, N or @-.@92..H, N or A.28.GLY.H, N; A.ALA.27.CA
Minimal: Residue Type and Number, e.g.G28 or @92 or G28; A27
You can set your preferred default peak labels in Project / Preferences (or type Ctrl/Cmd ,) in the Spectrum tab under Peak Annotations.
Peak symbols can be changed by typing PS or going to right-click / Cycle Peak Symbols. Again there are four options which you can cycle through:
Line widths: these are drawn as closed ellipses if the line width has been determined or dotted ellipses if the line width is unknown.
Filled line widths: these are drawn as filled ellipses if the line width has been determined or flower/star-style ellipses if the line width is unknown.
Again, your preferred default peak symbol can be set in Project / Preferences (or type Ctrl/Cmd ,) in the Spectrum tab under Symbols. You can also set your default symbol size and thickness here.
An alternative way to set peak labels and symbols is to click on the gear icon of a display module and then select the options desired, including symbol size and thickness. Note, therefore, that these features are properties of the display rather than of an individual peak list.
Peaks can be hidden/shown by right-clicking on a spectrum button in the Spectrum toolbar. Under Peak Lists you can show/hide the peaks belonging to one or all of the peak lists associated with that spectrum.
The colour of both the peak labels and the peak symbols can be changed and are properties of the peak list which the peaks belong to. To change the peak label and symbol colour, double-click on a peak list in the sidebar to bring up the Peak List Properties dialog and select the colours of your choice.