1-a) You added the Recent Posts Element in the last section of the Homepage and that is responsible for the blog items. You can use the items there to add blog posts from a specific category:
For more information: https://theme.co/apex/forum/t/shortcodes-recent-posts/173
1-b) Unfortunately we do not have such a feature out of the box. You will have a better chance using the Essential Grids extension which is bundled with the theme and add the grid as you like and then you will have an Essential Grid element at hand in the Cornerstone to add it wherever you want.
For more information: https://theme.co/apex/forum/t/extension-essential-grid/68
1-c) You can use the Marginless Feature to make the gap between each column go away and have bigger ones. To do so go to the Cornerstone> Section > Row that you have the images, click on the Magnifying Glass icon and enable that option:
2) That section is not part of our theme. It seems that it is generated from the Jetpack plugin. Read this article for more information: https://jetpack.com/support/related-posts/customize-related-posts/
3) You can use the method I told in 1-c and also you can use the helper classes to reduce the margins:
To add a class to a section or row or a column go to the proper option settings and click on the customize tab:
If you are using the new section in the latest version you will already have options for margin and padding already:
4-a) The title of each page follows the pattern of the headings which you set in theme options. Go to X > Launch > Options > Typography > Root Font Size and change the font sizes there properly and it will affect the size of the header.
Alternatively, you can add the CSS code below to X > Launch > Options > CSS:
Change the 25px to whatever value you like.
4-b) You can go to Posts > Categories select a category and you can change the title there as you wish:
5) The comments section is generated by a 3rd party plugin. The code generated has different markup than the original theme. You need to add the CSS code below:
I use the Google Chrome Developer Toolbar to find out which CSS code selectors I need to use:
6-a) Our theme does not support the Secondary Menu. You need to add the menu links HTML code manually by going to X > Launch > Options > Header > TopBar enabling it and adding your code there:
6-b) It is part of the WordPress and not X. You need to manage it from Appearance > Menus. The WordPress itself gives an option to manage the menus from Appearance > Customize too.
7) If you mean the result below:
That text is generated automatically by the theme. To change that you need to follow the same steps you would do to translate the theme but this time instead of translating you can add the text you like instead. For more information:
It seems that you are new to our theme. I strongly suggest that you bookmark our knowledgebase overview article which lists all available resources which you can search and find steps you will need to follow in most cases:
Kindly open up new threads for additional questions as it will help us to focus on each issue and give you a better support which you deserve. Having a long threads makes the maintaining job harder and also it will be harder for the other customers to find the correct information if they have similar issues. You are always welcomed to reply to this thread to follow up the same question.