Hi @SunilR,
The easiest way would be to right-click the "Previous button" and inspect the element. On the Parent tag element> ex: div tag
margin-left: 55px !important
adjust the margin-left pixel according to your need. Once you are happy with the position
In Portal studio:
1. Themes > Upload custom CSS > upload a file called "custom.css"
2. Add the margin-left CSS property which is mentioned above
3. Then press sync configuration and browse the website.
Additional thread for your kind reference
https://powerusers.microsoft.com/t5/Power-Apps-Portals/Change-background-colour-when-hover-over-navigation-menu-drop/m-p/892621
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