Hi, thanks for prompt reply. I just started trying things out and was having this issue out of the box, without any attempt of adding styles.
I tried with just text; then I tried a combination of text and 1 image.
I realized this problem occurs with the Default Layout. I changed it to "Expand the block to full width" and it behaved as expected while on 1/3, 1/3, 1/3.
...
Update: I just added this to the "Items Header" in the General Data and Files and it fixed the issue:
<style>
:root {
--am-flex-min-block-width: 12rem;
}
</style>