To Sticky Sidebar
Step 0 – Navigate to the Appearance section of the WordPress dashboard, then select Customize.
Step 1 – In the Customize menu, locate and click on Theme Options.
Step 2 – Find the option labeled Sticky Sidebar within the Theme Options panel.
Step 3 – Enable the Sticky Sidebar option to make the sidebar sticky, which keeps it visible if scroll down the page.
Step 4 – Once have made changes, click Publish to save them.