Currently, there is no property exposed in the Personas editor to control this. Technically speaking, it is possible to introduce this functionality. For us, it's much easier (and faster) to do it in Slipstream Engine than in webgui.
It is also possible to control properties by changing the DOM via scripting, although this is not something that we usually recommend or give guidance for - nevertheless, it is technically doable. Such a change will not work if you are running your flavor in SAP GUI for Windows or Java, in case that's interesting to you.
If you really need this, you could create a support incident, asking for a new feature to be added. Keep in mind that this doesn't guarantee that it will be added and no promise how long will this take, but such customer requests are certainly taken into account when shaping the product.
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