How to increase logo size?
To increase the size of the Logo, go to Journal>Skins>Default>Header> in Desktop Header Menu, for Classic, click on the small blue quick Edit button>
Go to General> Global Options> And for Header Height, increase the size from 100 to at least 150> Save at the top.
Now go to Logo section> and in Container Padding remove all padding from 27 to be empty> Save at the top.
After this go step back> and in the Header section> go to Mobile Header> Choose Mobile 2 and click on small blue quick edit button>Image
Go to Logo> and in Logo Padding> remove the padding for 10 and 18 to be nothing> press save at Top Image
Please make sure that after all these changes you clear the cache from your store. Go to System>Tools>NitroPack> Click on Clear Cache on the top right and from the drop-down click on "Clear All Cache" and you will be able to see changes loaded on your front page.