Hi Rohan,
For your first inquiry, if you’re trying to put the Featured image under the title, you may simply go to Appearance>Customize>Layout>Blog and modify the Location of the Featured image.
You may refer to this screenshot for reference: https://share.getcloudapp.com/eDul5ppq
Make sure you have the “Blog” module enabled in Appearance>GeneratePress.
As for your second inquiry, you may utilize the Layout metabox settings of a specific page. From the Layout metabox, you may disable the Content Title.
See this for reference: https://share.getcloudapp.com/o0uZRlOJ
You may locate this also at the righthand sidebar setting section of a specific page.
As an alternative, you may also use a Layout Element if you plan to disable the content title for multiple pages: https://docs.generatepress.com/article/layout-element-overview/#:~:text=a%20few%20pages.-,Disable%20Element,-Choose%20to%20disable
Kindly make sure that you have the “Disable Elements” module enabled in Appearance>GeneratePress to do this.
Hope this helps! 🙂