Particle System not showing up right away?

Question

Unity

My 2D toy needs an explosion effect, I decided to use the Particle System for the first time. It turned out not a good effect, after which I noticed that these particles are not displayed for the player. Using the poke method, I went through many parameters, did not find anything, but I realized that after the particle exists for more than 2.5 seconds, they are displayed.
Tell me how can I remove this delay in the output to the screen? Or am I doing something wrong?
Here are all the screenshots of the Particle System parameter settings