When I swipe down control center won’t appear

A forced restart of the iPad may be helpful - as a restart will often resolve an isolated software issue:

• On an iPad with a Home button: Press and hold the top button and the Home button at the same time. When the Apple logo appears, release both buttons.
• On other iPad models: Press and quickly release the volume up button, press and quickly release the volume down button, then press and hold the top button. When the Apple logo appears, release the button.

Go to settings and check for the control center and disable and enable it again and then restart it it's just a glitch