Axes style can be set in Figure Properties window (or Fit Plot Properties for Fit Plot). This window contains multiple tabs with axes drawing settings.
Figure Properties
Fit Plot Properties
Trace: • Adding and Arranging Axes on Figure • Switching Curves Antialiasing on the Screen • Batch Processing (Pro edition only) • Copying Images to Clipboard (Pro edition only) • Reading Plot Data, Measuring Distances, Curves Selection • Specifying Custom Fit Equation (Pro edition only) • Differentiation (Pro edition only) • Drawing on Figures and Fit Plots, Image Zoom and Objects Selection • Fast Fourier Transform (FFT) (Pro edition only) • Axes Style Editing