Changing properties of the popup

Use an event handler to customize the popup.

No box, different position, Fancy white background
import matplotlib.pyplot as plt
import numpy as np
import mplcursors

fig, axes = plt.subplots(ncols=2)

left_artist = axes[0].plot(range(11))
axes[0].set(title="No box, different position", aspect=1)

right_artist = axes[1].imshow(np.arange(100).reshape(10, 10))
axes[1].set(title="Fancy white background")

# Make the text pop up "underneath" the line and remove the box...
c1 = mplcursors.cursor(left_artist)
@c1.connect("add")
def _(sel):
    sel.annotation.set(position=(15, -15))
    # Note: Needs to be set separately due to matplotlib/matplotlib#8956.
    sel.annotation.set_bbox(None)

# Make the box have a white background with a fancier connecting arrow
c2 = mplcursors.cursor(right_artist)
@c2.connect("add")
def _(sel):
    sel.annotation.get_bbox_patch().set(fc="white")
    sel.annotation.arrow_patch.set(arrowstyle="simple", fc="white", alpha=.5)

plt.show()

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