What should I do if, when sending a message to VK, when I press Enter it goes to the next line??

When I hover over the 'Send' button, the sending settings come up, but Enter is still selected - send a message, and Shift+Enter - line break. WHAT TO DO??? Previously, when I pressed Enter, everything worked, but now it jumps to a new line. I am writing to you in support because in other browsers everything works as it should.