some people likes the Dock icon bounce effect and some don’t. Anway either if you want to disable of enable it here is the method. Read the following guide to know the process to disable or enable bouncing effect of application Dock icons on Mac.
How to Disable/Enable Bounce Effect of Dock Icons
Click on Apple logo > Dock and Dock Preferences option
Simply un-check the check box for Animate opening applications to disable bounce effect and check the box if you want to apply bounce effect for dock icons again
To make the change effective just close the window and you are done.