Bug with WordPress CiviCRM 5.29.1 Shoreditch Theme 0.1-alpha35 CiviMail Module CSS
For CiviCRM WordPress sites with Shoreditch Theme, on the CiviMail Module "Mailings" > "Scheduled and Sent Mailings" page the "more" option appears HIDDEN from user following upgrade to CiviCRM 5.29.1 / Shoreditch 0.1-alpha35. Inspecting the code shows the option is still present and user can still hover over the "more" option and click it, but otherwise visually it appears to be hidden.
Disabling the Shoreditch Theme Extension resolves the issue, so the CSS bug appears to have been introduced with the Shoreditch Theme 0.1-alpha35 released last month.