a) This will remove the themes padding which is adding the extra space.
You should then add the appropriate Left and Right padding to the Container Blocks.
Eg, 40px for Desktop, and less for Tablet / Mobile.
b) you won’t need to set the Align Full option on the Container Blocks.
I made a copy of your Home Page, called Draft Home.
In that copy i:
1. I opened the List view, and Shift Clicked All Container blocks.
2. With all of them selected:
2.1 I removed the Full Width option from the Toolbar.
2.2 I added 40px left and right padding and 20px on Mobile.
3. I set the Content Container to Full Width.
Can you check that to see how i did it , and if its ok ?