Place the flour in a large bowl and make a well in the center. Crumble the yeast into the well, add the sugar. Pour in the lukewarm water and let it sit for 5-10 minutes, until the yeast activates and becomes foamy.
Once the yeast is foamy, add the olive oil and salt. Mix well, then knead the dough until it is smooth and elastic.
Form the dough into a ball, place it back in the bowl, cover, and let it rest in a warm place for about 1 hour, or until doubled in size.
When the dough has risen, roll it out to a thickness of about 2-3 cm (approximately 1 inch). Place it in a baking sheet greased with olive oil.
Slice the vegetables (zucchini, bell pepper, tomatoes) into thin rounds.
Arrange the sliced vegetables on top of the dough, then scatter arugula leaves over them. Gently press down on the dough so the ingredients are embedded.
Bake in a preheated oven at 430°F (220°C) for 20-25 minutes, until the focaccia is golden brown and crispy.
After baking, let it cool for 10 minutes, then slice and serve.
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