This is quite easy:
- open the side bar and display the “contents” pane by clicking on the Compass icon (Navigator)
- click on a flag
- the corresponding object is highlighted in the Navigator
In your case, it tells Shape 1234 (Text Frame zzz…) where “zzz” is the beginning of the text.
Don’t be confused by the fact that a flag is shown: flag emojis are made of a pair of “letters” taken from a dedicated Unicode block.
You can confirm the emoji nature:
- put the cursor inside the text box immediately at right of the flag
- press Alt+X
This changes display of the preceding glyph to its hexadecimal encoding U+1234. The French flag changes to an “F” (first “letter” in the pair) and U+1F1F7 (corresponding the special R).
Emojis are characters. They are handled as text. So, think “typography”. All your other “decorations” (ski, fish, barbecue, sail boat) are text emojis. Your document contains a single image, the blurred photo at top left.
Since emojis are text, they can only appear where text is allowed. Therefore, you must use a shape, the simplest of which is a text box. The difficulty may come from this support requirement: text must be hosted by a Draw object.
Globally speaking, your document does not use styles. Draw styles are less user-friendly than Writer ones but their use would be beneficial to you because your text boxes can be grouped into "categories (headings, sub-headings, description, annotation, …). Styling them would allow to reformat the document centrally, without doing it on every text box.
You could perhaps do the same in Writer though it is not DTP (desktop publishing) program. You’d have simpler text flow management but you’d need also at least one frame (for the dark left pane) and Writer frames are very very (should be written seven times) difficult to master.