change sidebar close to chevron
<!-- Paramaters Accordion -->
<b-sidebar id="parameters" :visible="panel_open" v-model="panel_open" :width="panel_width+'vw'" @shown="dispatch_resize" @hidden="dispatch_resize"
shadow class="sidebar" title="Simulation configuration">
+ <template v-slot:header-close>
+ <b-button-close content="" v-b-toggle.parameters v-b-tooltip.hover.right title="Hide simulation configuration" class="ti-angle-double-left"></b-button-close>
+ </template>
+
<div role="tablist">
<!-- General Parameters -->
<b-card no-body>
