Issue -

Quick actions buttons have been configured per these articles https://learn.microsoft.com/en-us/power-apps/user/relevance-search#quick-actions 

For more information on how to configure quick actions, see https://learn.microsoft.com/en-us/power-platform/admin/configure-relevance-search-organization#configure-quick-actions-that-appear-with-dataverse-search-in-model-driven-apps  

OOB buttons show up fine both on search quick action & grid however custom button(any) are not showing up neither on Data Verse search quick action nor on grid. We have validated that this custom button shows up on home grid. 

Exact Repro Steps: On Data verse search, search for any account record, it will render matching records that will have quick actions associated on quick action menu & grid. 

We have tried with all 3 enable rules however they don't work for custom buttons -

ShowOnQuickAction 

ShowOnGridAndQuickAction 

ShowOnGrid 

We followed steps documented in our article https://learn.microsoft.com/en-us/power-apps/maker/model-driven-apps/command-designer-overview#command-bar-locations it seems that quick action buttons can be added or edited using new command designer however no luck(we don't see custom buttons showing up in quick action/search grid). We tried changing the order of the custom button , existing buttons were having 40,50 & 61 sequence numbers and we gave 45 for new custom button. Still we were not able to see the custom button.

Tools Used - Ribbon Workbench & new command designer.

References - Customize the command bar - Power Apps | Microsoft Learn

Ask - Can we have these ability to add custom quick actions button on DV search/in future versions/releases, this will enhance search experience for customer end users.