Limits are stored together in an Axis, but there should be xlims! and ylims! functions to adjust them individually. See Axis · Makie Plotting Ecosystem
You can also change the autolimit margins, which govern how much additional space the axis uses when determining autolimits!. I think that’s xautolimitmargin = (0.2, 0.2) and the y equivalent, you can also theme that beforehand for all axes