Header widget off page

Hi there,

That's because it's using absolute positioning in inline style:
<div class="norm_row sfsi_wDiv" style="width:225px;text-align:left;position:absolute;">

You will need to remove that or contact the plugin author on this.

The plugin you are using to insert the widgets isn't very well coded.

I would recommend Tom's Lightweight Social Icons plugin: https://en-ca.wordpress.org/plugins/lightweight-social-icons/

Thanks. I've replaced.
but now the header widget has tremendous padding. How is that shrunk up?

Can you try increasing the container width? https://docs.generatepress.com/article/container-width/