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When the grid is set a higher negative potential few electrons/cathode rays strike the screen thus the brightness is reduced.
When it’s set at a higher positive potential more electrons/cathode rays strike the screen thus the brightenes increases.
When the potential difference is increased more electrons reach the screen making the spot brighter. When the p.d is decreased fewer electrons reach the screen making the spot less bright.
When the negativity of the grid is increased, fewer electrons cross it; the intensity of the beam decreases, reducing the brightness of the spot on the screen.
When the grid is made less negative, more electrons cross, increasing the intensity of the electron beam. This increases the brightness of the spot on the screen.