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I'm assuming you're trying to get around the limitation with calendars in Lightning Experience where only one field can be selected as the Field Name to Display.
As you've already discovered, you can combine fields in a formula field. But the way Salesforce built its Calendar product, it looks like any line breaks will be stripped out of event names, ...
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Instead of using Lightning Card to achieve this, use Lightning Layout Item & write a Div tag inside it.
Then apply this Class & CSS to it - style:"border: 2px solid rgb(101, 153, 205);" & class="slds box".
Below is an example of it will look. I used it in my case.
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extends="force:slds" include this at the top in your application like
<aura:application extends="force:slds">
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To use Javascript and a lightning web component instead of aura you can use a dynamic class change variable for the section.
<template>
<div id="ExpandableCalendarSection" class={BookCalClass}>
<h3 class="slds-section__title" style='padding-bottom:0;'>
<button aria-controls="expandoBookingCalendar" aria-expanded="true" ...
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