Exporting in Kdenlive means Rendering, or vice versa. Rendering turns the project's timeline with all the edited clips into the final product: a single complete video file.
Kdenlive uses Presets or Rendering Profiles to control or determine the output. You can create your own presets and profiles.
Hit Ctrl+Return to open the rendering dialog or use theand click on the render button .
Select the Output file location
Select the desired Presets. MP4-H264/AAC works nearly everywhere.
Click on Render to File button.