chrome://discards/
Order by "Utility Rank" descending.. Number of tabs open is the highest "Utility Rank" number shown.This can be set from this page...
chrome://settings/
However, if your browser is "managed by your organization" then the option may be greyed out. To override this (assuming you have the rights to edit the registry)...
chrome://policy/
To change...
regedit
Software\Policies\Google\Chrome\RestoreOnStartup
5 = Open New Tab Page
1 = Restore the last session
4 = Open a list of URLs
If you set to 4 then you should also set...
Software\Policies\Google\Chrome\RestoreOnStartupURLs