figma jam barra de herramientas inferior

Hi ​@Natalia Crecente García, thanks for reaching out! 

I do not speak Spanish, so I hope it is ok that I am replying in English. Did you accidentally Hide UI in FigJam? 

Please try using the shortcut Ctrl/Cmd + \ to Show UI, and let me know if that helps. If not, we can continue troubleshooting this together. 

Thank you. Problem solved