I'd like a larger sidebar on the right

@Guillaume: If you want larger sidebar then you need to decrease the content width. Let me know your desire width and site URL then I will send you custom css that you can add to change the width.

@Guillaume: You shouldn’t edit any core theme files like style.css, index.php, functions.php and so on, inside ‘catch-kathmandu-pro’ theme directory. As these files will be reverted back to original when you update your theme.

So, to edit css, you can either add it in “Appearance => Theme Options => Custom CSS” box or build child theme and add it in child theme style.css

So, you can add the following css in “Appearance => Theme Options => Custom CSS” box:

#primary { width: 750px; }
#secondary { width: 380px; }
@media screen and (max-width: 1344px) {
	#primary { width: 700px; }
	#secondary { width: 380px; }
}
@media screen and (max-width: 1280px) {
	#primary { width: 620px; }
	#secondary { width: 360px; }
}
@media screen and (max-width: 1152px) {
	#primary { width: 540px; }
	#secondary { width: 340px; }
}
@media screen and (max-width: 1024px) {
	#primary { width: 480px; }
	#secondary { width: 340px; }
}
@media screen and (max-width: 960px) {	
	#primary, #secondary { width: 100%; }
}