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Currently, only a particular cluster node can be started/stopped. It is needed to be able start/stop the entire cluster.

https://github.com/ClusterLabs/pcs-web-ui/commit/2507d632bd6142023f14278262762c0ea9dea0de

DevTestResults:

[root@r92-1 ~]# rpm -q pcs
pcs-0.11.3-5.el9.x86_64

1. Add a cluster into the web ui
2. In the Clusters dashbord click on cluster name
3. In the cluster detail there are 2 newly added buttons 'Start' and 'Stop'

Buttons works as expected. After confirming a dialog window the selected action is performed.

[root@virt-594 ~]# rpm -q pcs
pcs-0.11.4-4.el9.x86_64

Only a basic check for this implemented feature of stopping/starting the entire cluster has been performed. 
After selecting the desired 'cluster' from the list of available clusters, the entire cluster can be reliably started or stopped by using the available 'Start' and 'Stop' buttons.
This new feature works reliably even in the case of multiple cluster starts or stops.

Marking as VERIFIED SanityOnly for pcs-0.11.4-4.el9

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (pcs bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:2151