The subscription settings page can be set separately for each feed, or for categories, or global settings.
Through the gear icon in the upper right corner, you can enter the global settings page.
In the global settings page, you can set some options.
When you need to apply a global setting to all feeds, you can click the second icon to the right of the setting. This way, you can quickly apply this setting to all feeds.
Click the first icon to the right of a setting to set the options.