If the login icon is not visible in the mobile header, this is intentional. On smaller screens, adding too many header icons can cause wrapping and layout issues.
Instead, place the login link inside the mobile side drawer menu.
Support note: "This was done intentionally as adding multiple icons/text to your header bar on mobile will cause your menu items to display oddly. This can be set up by creating a Login button via your Drawer menu and linking it to /account."
Add the login link in your drawer menu
In Shopify, go to Online Store > Themes > Customize.
Open Theme settings > Header.
Under Drawer menu, choose the menu used for mobile navigation.
Click Edit menu.
Add a new menu item:
Label:Login (or Log in)
Link:/account
Save the menu, then save your theme changes.
Check customer account settings
If the link still does not work as expected, make sure customer accounts are enabled in Shopify admin > Settings > Customer accounts.
SpaceAdd login to mobile menu drawer
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