Confirmation message near the button

FAQ > The spinning arrow icon shows up once I submit a form, but then nothing happens.

Thank you but what do you mean by “switching to the default theme” ?

When you install WordPress it includes a few default themes. https://codex.www.ads-software.com/WordPress_Default_Themes

Here are instructions for switching themes. https://codex.www.ads-software.com/Using_Themes#Selecting_the_Active_Theme

This is a technique commonly used in WordPress to find what is actually causing a particular problem.

Switch temporarily (nothing will be lost when you switch back) to a WP default theme & disable all plugins other than Contact Form 7 to see if the problem goes away.

If it does you can switch back to your theme & re-activate each plugin one by one to see when the problem occurs.

No the problem is still here !
What can i do ?

When I sent a message, the message sends well but the button continues to load.

The spinning arrow is a common sign of a JavaScript conflict.

Did you disable all plugins other than Contact Form 7 to see if the problem goes away?

Yes I disable all plugins but the problem is still here !
There is an other solution ? My theme is H-code.