Generally, for opening the Settings and Advanced Find pages, you need to open any existing app.
Will show you some simple tips to open them without opening any App and also, this works both in Dynamics 365 CE Online and On-premises.
Settings
Append the text settingsonly=true to the Dynamics 365 CE Environment URL after main.aspx.
Example
https://contosodev.crm5.dynamics.com/main.aspx?settingsonly=true
Advanced Find
Append the text pagetype=advancedfind to the Dynamics 365 CE Environment URL after main.aspx.
Example
https://contosodev.crm5.dynamics.com/main.aspx?pagetype=advancedfind
Hope you have Bookmarked the URLs to open the required pages quickly without opening any Apps.
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