how to move sidebar to the right side to increase the content space?
You can achieve this by reducing sidebar width and increasing content width by using the CSS solution shared in the following topic.
https://colorlibsupport.com/t/add-space-between-main-content-area-and-sidebar/#post-64611
Last thing is how to delete page title? I was looking in page.php and I cannot find title code. Do you have an idea where can I found it?
You can use below CSS code to remove it.
.page header.entry-header.page-header {
display: none;
}