SharePoint Configure Default Search page to Search box
If you want to set default search page to search box, please follw below steps.
First create your search page.
Ex:Search.aspx
Now open sharePoint site
Click on Site Settings
Click on Search Settings under Search
Uncheck Checkbox of: Which search results page should queries be sent to?
Select radio button:Send queries to a custom results page URL.
Type url of the search page at Results page URL:
Ok
Above steps will work for SPO also
If you want to set default search page to search box, please follw below steps.
First create your search page.
Ex:Search.aspx
Now open sharePoint site
Click on Site Settings
Click on Search Settings under Search
Uncheck Checkbox of: Which search results page should queries be sent to?
Select radio button:Send queries to a custom results page URL.
Type url of the search page at Results page URL:
Ok
Above steps will work for SPO also